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#281
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Switchable Wall Outlet
On Wed, 28 Dec 2016 05:11:38 -0000, wrote:
On Tue, 27 Dec 2016 20:43:29 -0000, "James Wilkinson Sword" wrote: On Tue, 27 Dec 2016 01:52:40 -0000, wrote: On Mon, 26 Dec 2016 22:20:37 -0000, "James Wilkinson Sword" wrote: On Mon, 26 Dec 2016 22:12:19 -0000, wrote: On Mon, 26 Dec 2016 16:48:10 -0500, Ralph Mowery wrote: snip We used to always say the 5ma GFCI will keep you from being electrocuted but it doesn't keep you from falling off the ladder. And serves no purpose at all if you touch live and neutral, which is just as likely unless you have stuff earthed everywhere. I tend not to earth things, as all it does is increase the chance of shock. You already said you have a wood floor so there is not much ground around you. The rules change pretty quickly when you are slab on grade. Concrete is a pretty good conductor. If you are standing on a tile floor and touch something hot, you get it the worst way, right through your core. Rules are for the obedience of fools. No, rules are for the PROTECTION of fools. No, we don't give a **** if a fool kills himself., the rest of us can make our own decisions. So, are you a fool or can you make your own decisions? -- Why is a person who plays the piano called a pianist but a person who drives a racing car not called a racist? |
#282
Posted to alt.home.repair
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Switchable Wall Outlet
"Uncle Monster" wrote in message ... On Thursday, December 22, 2016 at 5:37:53 PM UTC-6, James Wilkinson Sword wrote: On Thu, 22 Dec 2016 19:57:23 -0000, Dave C wrote: I have an AC wall socket, currently controlled by a wall switch. I would like to change that outlet, so the one of the plugs is always ON. The other plug would remaqin as is, ergo controlled by the wall switch. I purchased a prior house with that configuartion for one socket. Alas I never looked to see how that "split" outlet configuration was implemented. Can one inform me, how to make this change? Thanks What century are you living in? All my sockets have switches on them. You do know that North American wiring standards, voltages and frequency of normal AC power for homes. business and industry are quite different from those of Europe? Your inductive hum is lower and more masculine. I suppose that's a point of pride for you. ヽ(ヅ)ノ [8~{} Uncle Humming Monster It seems to me that some of you guys trying to sale your knowledge here, which in my opinion is very poor. Person must have common sense in any line of work and when you are ask question Simplicity is the right answer not what degree you have or what the Ohms law is, these days you learn that in third grade of school. Regarding school it is not always how much of education have but do you know how to use it. There are many people that have College Degrees but are sweeping floors because are; incapable putting education in use! Another subject there is many different Transformers, Most common is iron core, that could be made of row iron stocked pieces that makes the core and it is use up too 400 Hrz. Presently we have ferret iron cores transformers that will work into very high Frequency depend on density of iron/material that core is made of, it has became very popular. Then we have Air core which is use in High frequency including Micro wave. Voltage drops at 50or 60 Hrz. virtually dont exist in open circuit unless you are running mile and miles of line. In normal use on open line if there or no load/current there is no Voltage drop, you must have current present to have Voltage drop. In radio Frequency there are voltages drops example you radio Antenna can be an open circuit there are current and voltage drop present when transmitter is on! My question is why would I go into electrical theory to some one that wants to know how or can he change duplex receptacle from single source to double supply??? Unless he is trying too empress "us"; Stupid. Yes it is needless to say Stupid |
#283
Posted to alt.home.repair
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Switchable Wall Outlet
On Wed, 28 Dec 2016 20:19:47 -0000, Tony944 wrote:
"Uncle Monster" wrote in message ... On Thursday, December 22, 2016 at 5:37:53 PM UTC-6, James Wilkinson Sword wrote: On Thu, 22 Dec 2016 19:57:23 -0000, Dave C wrote: I have an AC wall socket, currently controlled by a wall switch. I would like to change that outlet, so the one of the plugs is always ON. The other plug would remaqin as is, ergo controlled by the wall switch. I purchased a prior house with that configuartion for one socket. Alas I never looked to see how that "split" outlet configuration was implemented. Can one inform me, how to make this change? Thanks What century are you living in? All my sockets have switches on them.. You do know that North American wiring standards, voltages and frequency of normal AC power for homes. business and industry are quite different from those of Europe? Your inductive hum is lower and more masculine. I suppose that's a point of pride for you. ヽ(ヅ)ノ [8~{} Uncle Humming Monster It seems to me that some of you guys trying to sale your knowledge here, which in my opinion is very poor. Person must have common sense in any line of work and when you are ask question Simplicity is the right answer not what degree you have or what the Ohms law is, these days you learn that in third grade of school. Regarding school it is not always how much of education have but do you know how to use it. There are many people that have College Degrees but are sweeping floors because are; incapable putting education in use! Another subject there is many different Transformers, Most common is iron core, that could be made of row iron stocked pieces that makes the core and it is use up too 400 Hrz. Presently we have ferret iron cores transformers that will work into very high Frequency depend on density of iron/material that core is made of, it has became very popular. Then we have Air core which is use in High frequency including Micro wave. Voltage drops at 50or 60 Hrz. virtually dont exist in open circuit unless you are running mile and miles of line. In normal use on open line if there or no load/current there is no Voltage drop, you must have current present to have Voltage drop. In radio Frequency there are voltages drops example you radio Antenna can be an open circuit there are current and voltage drop present when transmitter is on! My question is why would I go into electrical theory to some one that wants to know how or can he change duplex receptacle from single source to double supply??? Unless he is trying too empress "us"; Stupid. Yes it is needless to say Stupid The voltage always drops somewhere. In open circuit, it's across the gap. -- If you eat a judge's uniform you might contract a lawsuit. |
#284
Posted to alt.home.repair
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Switchable Wall Outlet
After serious thinking James Wilkinson Sword wrote :
On Wed, 28 Dec 2016 20:19:47 -0000, Tony944 wrote: "Uncle Monster" wrote in message ... On Thursday, December 22, 2016 at 5:37:53 PM UTC-6, James Wilkinson Sword wrote: On Thu, 22 Dec 2016 19:57:23 -0000, Dave C wrote: I have an AC wall socket, currently controlled by a wall switch. I would like to change that outlet, so the one of the plugs is always ON. The other plug would remaqin as is, ergo controlled by the wall switch. I purchased a prior house with that configuartion for one socket. Alas I never looked to see how that "split" outlet configuration was implemented. Can one inform me, how to make this change? Thanks What century are you living in? All my sockets have switches on them. You do know that North American wiring standards, voltages and frequency of normal AC power for homes. business and industry are quite different from those of Europe? Your inductive hum is lower and more masculine. I suppose that's a point of pride for you. ヽ(ヅ)ノ [8~{} Uncle Humming Monster It seems to me that some of you guys trying to sale your knowledge here, which in my opinion is very poor. Person must have common sense in any line of work and when you are ask question Simplicity is the right answer not what degree you have or what the Ohms law is, these days you learn that in third grade of school. Regarding school it is not always how much of education have but do you know how to use it. There are many people that have College Degrees but are sweeping floors because are; incapable putting education in use! Another subject there is many different Transformers, Most common is iron core, that could be made of row iron stocked pieces that makes the core and it is use up too 400 Hrz. Presently we have ferret iron cores transformers that will work into very high Frequency depend on density of iron/material that core is made of, it has became very popular. Then we have Air core which is use in High frequency including Micro wave. Voltage drops at 50or 60 Hrz. virtually dont exist in open circuit unless you are running mile and miles of line. In normal use on open line if there or no load/current there is no Voltage drop, you must have current present to have Voltage drop. In radio Frequency there are voltages drops example you radio Antenna can be an open circuit there are current and voltage drop present when transmitter is on! My question is why would I go into electrical theory to some one that wants to know how or can he change duplex receptacle from single source to double supply??? Unless he is trying too empress "us"; Stupid. Yes it is needless to say Stupid The voltage always drops somewhere. In open circuit, it's across the gap. No, it is not. The voltage across the gap (or cap) is the supply voltage. If the voltage across the gap was less than the supply voltage, as it would be when still charging, then you would have a drop somewhere (the conductors). There is no current through the gap (or cap) at all, and no dissipation, even when charging, and therefore no voltage drop across it. |
#285
Posted to alt.home.repair
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Switchable Wall Outlet
On Wed, 28 Dec 2016 21:08:19 -0000, FromTheRafters wrote:
After serious thinking James Wilkinson Sword wrote : On Wed, 28 Dec 2016 20:19:47 -0000, Tony944 wrote: "Uncle Monster" wrote in message ... On Thursday, December 22, 2016 at 5:37:53 PM UTC-6, James Wilkinson Sword wrote: On Thu, 22 Dec 2016 19:57:23 -0000, Dave C wrote: I have an AC wall socket, currently controlled by a wall switch. I would like to change that outlet, so the one of the plugs is always ON. The other plug would remaqin as is, ergo controlled by the wall switch. I purchased a prior house with that configuartion for one socket. Alas I never looked to see how that "split" outlet configuration was implemented. Can one inform me, how to make this change? Thanks What century are you living in? All my sockets have switches on them. You do know that North American wiring standards, voltages and frequency of normal AC power for homes. business and industry are quite different from those of Europe? Your inductive hum is lower and more masculine. I suppose that's a point of pride for you. ヽ(ヅ)ノ [8~{} Uncle Humming Monster It seems to me that some of you guys trying to sale your knowledge here, which in my opinion is very poor. Person must have common sense in any line of work and when you are ask question Simplicity is the right answer not what degree you have or what the Ohms law is, these days you learn that in third grade of school. Regarding school it is not always how much of education have but do you know how to use it. There are many people that have College Degrees but are sweeping floors because are; incapable putting education in use! Another subject there is many different Transformers, Most common is iron core, that could be made of row iron stocked pieces that makes the core and it is use up too 400 Hrz. Presently we have ferret iron cores transformers that will work into very high Frequency depend on density of iron/material that core is made of, it has became very popular. Then we have Air core which is use in High frequency including Micro wave. Voltage drops at 50or 60 Hrz. virtually dont exist in open circuit unless you are running mile and miles of line. In normal use on open line if there or no load/current there is no Voltage drop, you must have current present to have Voltage drop. In radio Frequency there are voltages drops example you radio Antenna can be an open circuit there are current and voltage drop present when transmitter is on! My question is why would I go into electrical theory to some one that wants to know how or can he change duplex receptacle from single source to double supply??? Unless he is trying too empress "us"; Stupid. Yes it is needless to say Stupid The voltage always drops somewhere. In open circuit, it's across the gap. No, it is not. The voltage across the gap (or cap) is the supply voltage. If the voltage across the gap was less than the supply voltage, as it would be when still charging, then you would have a drop somewhere (the conductors). There is no current through the gap (or cap) at all, and no dissipation, even when charging, and therefore no voltage drop across it. This appears to be a philosophical argument. As I see it, you have say 240 volts at the supply, and that voltage is dropped as you go round the circuit. It could be 10 volts across some wires, and 230 across a heating element. When it's switched off, all the drop is across the switch.. -- A group of white South Africans recently killed a black lawyer because he was black. That was wrong. They should have killed him because he was a lawyer. |
#287
Posted to alt.home.repair
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Switchable Wall Outlet
On Wednesday, December 28, 2016 at 4:33:37 PM UTC-5, James Wilkinson Sword wrote:
On Wed, 28 Dec 2016 21:08:19 -0000, FromTheRafters wrote: After serious thinking James Wilkinson Sword wrote : On Wed, 28 Dec 2016 20:19:47 -0000, Tony944 wrote: "Uncle Monster" wrote in message ... On Thursday, December 22, 2016 at 5:37:53 PM UTC-6, James Wilkinson Sword wrote: On Thu, 22 Dec 2016 19:57:23 -0000, Dave C wrote: I have an AC wall socket, currently controlled by a wall switch. I would like to change that outlet, so the one of the plugs is always ON. The other plug would remaqin as is, ergo controlled by the wall switch. I purchased a prior house with that configuartion for one socket. Alas I never looked to see how that "split" outlet configuration was implemented. Can one inform me, how to make this change? Thanks What century are you living in? All my sockets have switches on them. You do know that North American wiring standards, voltages and frequency of normal AC power for homes. business and industry are quite different from those of Europe? Your inductive hum is lower and more masculine. I suppose that's a point of pride for you. ヽ(ヅ)ノ [8~{} Uncle Humming Monster It seems to me that some of you guys trying to sale your knowledge here, which in my opinion is very poor. Person must have common sense in any line of work and when you are ask question Simplicity is the right answer not what degree you have or what the Ohms law is, these days you learn that in third grade of school. Regarding school it is not always how much of education have but do you know how to use it. There are many people that have College Degrees but are sweeping floors because are; incapable putting education in use! Another subject there is many different Transformers, Most common is iron core, that could be made of row iron stocked pieces that makes the core and it is use up too 400 Hrz. Presently we have ferret iron cores transformers that will work into very high Frequency depend on density of iron/material that core is made of, it has became very popular. Then we have Air core which is use in High frequency including Micro wave. Voltage drops at 50or 60 Hrz. virtually dont exist in open circuit unless you are running mile and miles of line. In normal use on open line if there or no load/current there is no Voltage drop, you must have current present to have Voltage drop. In radio Frequency there are voltages drops example you radio Antenna can be an open circuit there are current and voltage drop present when transmitter is on! My question is why would I go into electrical theory to some one that wants to know how or can he change duplex receptacle from single source to double supply??? Unless he is trying too empress "us"; Stupid. Yes it is needless to say Stupid The voltage always drops somewhere. In open circuit, it's across the gap. No, it is not. The voltage across the gap (or cap) is the supply voltage. If the voltage across the gap was less than the supply voltage, as it would be when still charging, then you would have a drop somewhere (the conductors). There is no current through the gap (or cap) at all, and no dissipation, even when charging, and therefore no voltage drop across it. This appears to be a philosophical argument. As I see it, you have say 240 volts at the supply, and that voltage is dropped as you go round the circuit. It could be 10 volts across some wires, and 230 across a heating element. When it's switched off, all the drop is across the switch. -- A group of white South Africans recently killed a black lawyer because he was black. That was wrong. They should have killed him because he was a lawyer. Don't forget that Rafters came up with this gem: With no power, you have no voltage drop. This is because voltage drop refers to the energy lost mainly through dissipation which happens when there *is* charge flowing through a resistance. No current, no voltage drop. Voltage drop does not refer to energy lost or to dissipation. Take a capacitor and a resistor in series with a voltage source. urn on the voltage source. Initially, all the voltage drop is across the resistor, it's equal to the source voltage. As the cap charges, there will be voltage drop across the cap, and less across the resistor. Add them up and they will equal the source voltage. This is Kirchoff's voltage law, the sum of all the voltage drops around the circuit must equal zero. When the cap is fully charged, there will be a voltage drop across it and it will equal the source. There is no current flowing, no power dissipation, but Kirchoff's Law still works. |
#288
Posted to alt.home.repair
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Switchable Wall Outlet
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#289
Posted to alt.home.repair
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Switchable Wall Outlet
On Wednesday, December 28, 2016 at 4:47:10 PM UTC-6, Ralph Mowery wrote:
In article , says... And Ohms Law still applies and works. V = IR. I=0, gives V =0, the voltage drop across the conductors is zero. Nor was there any division by zero, so don't start in with that again, please. I wouldn't dream of it, but given I=0 and nothing else, you can't nail down V nor can you nail down R by using Ohm's Law. Ohm's Law does *not* There is always some current flowing. It may only be a couple of electrons and not detectable by any common means. In the simple circuit where there is a switch and the insulation is several inches between conductors when the switch is in the off position, there is still a very , very small current flow across a very large resistance. Therefor as they say 99 and 44/100 % of the voltage is dropped across the switch when it is in the open position. All of this is picking the nits off the nits. So ther is never a 0 in the equation. You just have to look very hard to find the components. I don't think the contrarians will be happy until you get down to the quantum level. (・_・ヾ [8~{} Uncle Atomic Monster |
#291
Posted to alt.home.repair
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Switchable Wall Outlet
On Wed, 28 Dec 2016 22:54:43 -0000, Ralph Mowery wrote:
In article , says... Voltage drop does not refer to energy lost or to dissipation. Take a capacitor and a resistor in series with a voltage source. urn on the voltage source. Initially, all the voltage drop is across the resistor, it's equal to the source voltage. As the cap charges, there will be voltage drop across the cap, and less across the resistor. Add them up and they will equal the source voltage. This is Kirchoff's voltage law, the sum of all the voltage drops around the circuit must equal zero. When the cap is fully charged, there will be a voltage drop across it and it will equal the source. There is no current flowing, no power dissipation, but Kirchoff's Law still works. The capacitor will never fully charge. There is a time constant where the capacitor charges to about 63.2 % . Usually 5 time constants are concidered fully charged, but it never reaches a true full charge. Don't forget that there is no perfect insulator on earth, so some microscopic current is flowing all the time through the capacitor. So say the nit pickers. What if someone shorts the resistor for a bit? -- Some people are like slinkies, not really good for anything, but they bring a smile to your face when pushed down the stairs. |
#292
Posted to alt.home.repair
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Switchable Wall Outlet
James Wilkinson Sword submitted this idea :
On Wed, 28 Dec 2016 21:08:19 -0000, FromTheRafters wrote: After serious thinking James Wilkinson Sword wrote : On Wed, 28 Dec 2016 20:19:47 -0000, Tony944 wrote: "Uncle Monster" wrote in message ... On Thursday, December 22, 2016 at 5:37:53 PM UTC-6, James Wilkinson Sword wrote: On Thu, 22 Dec 2016 19:57:23 -0000, Dave C wrote: I have an AC wall socket, currently controlled by a wall switch. I would like to change that outlet, so the one of the plugs is always ON. The other plug would remaqin as is, ergo controlled by the wall switch. I purchased a prior house with that configuartion for one socket. Alas I never looked to see how that "split" outlet configuration was implemented. Can one inform me, how to make this change? Thanks What century are you living in? All my sockets have switches on them. You do know that North American wiring standards, voltages and frequency of normal AC power for homes. business and industry are quite different from those of Europe? Your inductive hum is lower and more masculine. I suppose that's a point of pride for you. ヽ(ヅ)ノ [8~{} Uncle Humming Monster It seems to me that some of you guys trying to sale your knowledge here, which in my opinion is very poor. Person must have common sense in any line of work and when you are ask question Simplicity is the right answer not what degree you have or what the Ohms law is, these days you learn that in third grade of school. Regarding school it is not always how much of education have but do you know how to use it. There are many people that have College Degrees but are sweeping floors because are; incapable putting education in use! Another subject there is many different Transformers, Most common is iron core, that could be made of row iron stocked pieces that makes the core and it is use up too 400 Hrz. Presently we have ferret iron cores transformers that will work into very high Frequency depend on density of iron/material that core is made of, it has became very popular. Then we have Air core which is use in High frequency including Micro wave. Voltage drops at 50or 60 Hrz. virtually dont exist in open circuit unless you are running mile and miles of line. In normal use on open line if there or no load/current there is no Voltage drop, you must have current present to have Voltage drop. In radio Frequency there are voltages drops example you radio Antenna can be an open circuit there are current and voltage drop present when transmitter is on! My question is why would I go into electrical theory to some one that wants to know how or can he change duplex receptacle from single source to double supply??? Unless he is trying too empress "us"; Stupid. Yes it is needless to say Stupid The voltage always drops somewhere. In open circuit, it's across the gap. No, it is not. The voltage across the gap (or cap) is the supply voltage. If the voltage across the gap was less than the supply voltage, as it would be when still charging, then you would have a drop somewhere (the conductors). There is no current through the gap (or cap) at all, and no dissipation, even when charging, and therefore no voltage drop across it. This appears to be a philosophical argument. Not philosophical so much as unimportant to the jobs done by electrical engineers. People can use computers just fine without knowing how they work, and the same goes for electrical circuit theory and electrical work and those who use calculus and the mathematics behind it. As I see it, you have say 240 volts at the supply, and that voltage is dropped as you go round the circuit. It could be 10 volts across some wires, and 230 across a heating element. When it's switched off, all the drop is across the switch. I'm not suggesting that there is no difference of potential across the switch, I am saying that the difference of potential across the switch is not there because of dissipation. Heat is not the only way that energy can be dissipated, but it *is* the usual one. Emphasis asterisks are added by me. "Voltage drop describes how energy is supplied of a voltage source that is reduced *as electric current moves through the passive elements (elements that do not supply voltage) of an electrical circuit*. Voltage drops across internal resistances of the source, across conductors, across contacts, and across connectors are undesired as the supplied energy is lost (dissipated). Voltage drops across loads and across other active circuit elements are desired as the supplied energy performs useful work." From: https://en.wikipedia.org/wiki/Voltage_drop "Dissipation Energy "The conversion of mechanical energy into heat is called energy dissipation." François Roddier[1] *The term is also applied to the loss of energy due to generation of unwanted heat in electric and electronic circuits*." From: https://en.wikipedia.org/wiki/Dissipation and "An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces *through which electric current can flow*." From: https://en.wikipedia.org/wiki/Electronic_circuit Electric current can't flow when the switch is open, and it is no longer a *circuit* by the definition used in circuit theory. Even when the switch replaced by a capacitor and the capacitor is charging, no current flows through the capacitor. There is no dissipation in the capacitor due to the no current condition, and hence no voltage drop across the capacitor. It is easy to misunderstand concepts when one throws out word meanings as 'merely semantics'. Not that you have done so to the best of my recollection, but others sure have. If one doesn't 'pick nits' they can often lose subtle underpinnings of complex concepts. |
#293
Posted to alt.home.repair
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Switchable Wall Outlet
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#294
Posted to alt.home.repair
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Switchable Wall Outlet
On Wed, 28 Dec 2016 23:17:41 -0000, FromTheRafters wrote:
James Wilkinson Sword submitted this idea : On Wed, 28 Dec 2016 21:08:19 -0000, FromTheRafters wrote: After serious thinking James Wilkinson Sword wrote : On Wed, 28 Dec 2016 20:19:47 -0000, Tony944 wrote: "Uncle Monster" wrote in message ... On Thursday, December 22, 2016 at 5:37:53 PM UTC-6, James Wilkinson Sword wrote: snip snip You do know that North American wiring standards, voltages and frequency of normal AC power for homes. business and industry are quite different from those of Europe? Your inductive hum is lower and more masculine. I suppose that's a point of pride for you. ヽ(ヅ)ノ [8~{} Uncle Humming Monster It seems to me that some of you guys trying to sale your knowledge here, which in my opinion is very poor. Person must have common sense in any line of work and when you are ask question Simplicity is the right answer not what degree you have or what the Ohms law is, these days you learn that in third grade of school. Regarding school it is not always how much of education have but do you know how to use it. There are many people that have College Degrees but are sweeping floors because are; incapable putting education in use! Another subject there is many different Transformers, Most common is iron core, that could be made of row iron stocked pieces that makes the core and it is use up too 400 Hrz. Presently we have ferret iron cores transformers that will work into very high Frequency depend on density of iron/material that core is made of, it has became very popular. Then we have Air core which is use in High frequency including Micro wave. Voltage drops at 50or 60 Hrz. virtually dont exist in open circuit unless you are running mile and miles of line. In normal use on open line if there or no load/current there is no Voltage drop, you must have current present to have Voltage drop. In radio Frequency there are voltages drops example you radio Antenna can be an open circuit there are current and voltage drop present when transmitter is on! My question is why would I go into electrical theory to some one that wants to know how or can he change duplex receptacle from single source to double supply??? Unless he is trying too empress "us"; Stupid. Yes it is needless to say Stupid The voltage always drops somewhere. In open circuit, it's across the gap. No, it is not. The voltage across the gap (or cap) is the supply voltage. If the voltage across the gap was less than the supply voltage, as it would be when still charging, then you would have a drop somewhere (the conductors). There is no current through the gap (or cap) at all, and no dissipation, even when charging, and therefore no voltage drop across it. This appears to be a philosophical argument. Not philosophical so much as unimportant to the jobs done by electrical engineers. People can use computers just fine without knowing how they work, and the same goes for electrical circuit theory and electrical work and those who use calculus and the mathematics behind it. As I see it, you have say 240 volts at the supply, and that voltage is dropped as you go round the circuit. It could be 10 volts across some wires, and 230 across a heating element. When it's switched off, all the drop is across the switch. I'm not suggesting that there is no difference of potential across the switch, I am saying that the difference of potential across the switch is not there because of dissipation. Heat is not the only way that energy can be dissipated, but it *is* the usual one. Emphasis asterisks are added by me. "Voltage drop describes how energy is supplied of a voltage source that is reduced *as electric current moves through the passive elements (elements that do not supply voltage) of an electrical circuit*. Voltage drops across internal resistances of the source, across conductors, across contacts, and across connectors are undesired as the supplied energy is lost (dissipated). Voltage drops across loads and across other active circuit elements are desired as the supplied energy performs useful work." From: https://en.wikipedia.org/wiki/Voltage_drop "Dissipation Energy "The conversion of mechanical energy into heat is called energy dissipation." François Roddier[1] *The term is also applied to the loss of energy due to generation of unwanted heat in electric and electronic circuits*." From: https://en.wikipedia.org/wiki/Dissipation and "An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces *through which electric current can flow*." From: https://en.wikipedia.org/wiki/Electronic_circuit Electric current can't flow when the switch is open, and it is no longer a *circuit* by the definition used in circuit theory. Even when the switch replaced by a capacitor and the capacitor is charging, no current flows through the capacitor. There is no dissipation in the capacitor due to the no current condition, and hence no voltage drop across the capacitor. It is easy to misunderstand concepts when one throws out word meanings as 'merely semantics'. Not that you have done so to the best of my recollection, but others sure have. If one doesn't 'pick nits' they can often lose subtle underpinnings of complex concepts. Take a very thin wire used to supply your load. Big voltage drop, right? As the wire gets thinner and thinner, the voltage drop increases, right? As the wire become infinitely thin, the voltage drop increases to the load voltage, an open circuit. -- "I'm prescribing these pills for you," said the doctor to the overweight patient, who tipped the scales at about three hundred pounds. "I don't want you to swallow them. Just spill them on the floor twice a day and pick them up, one at a time." |
#295
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Switchable Wall Outlet
On Wed, 28 Dec 2016 23:21:52 -0000, Ralph Mowery wrote:
In article , says... The capacitor will never fully charge. There is a time constant where the capacitor charges to about 63.2 % . Usually 5 time constants are concidered fully charged, but it never reaches a true full charge. Don't forget that there is no perfect insulator on earth, so some microscopic current is flowing all the time through the capacitor. So say the nit pickers. What if someone shorts the resistor for a bit? The wire doing the shorting has some very low resistance, not counting the wires from the source fo the voltage. Just as there is no perfect insulator, there is no perfect conductor. Then pre charge the capacitor with a bigger load. It is possible to make the capacitor and the battery have precisely the same voltage. -- Wedding rings: the world's smallest handcuffs. |
#296
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Switchable Wall Outlet
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#297
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Switchable Wall Outlet
On Wed, 28 Dec 2016 23:48:58 -0000, Ralph Mowery wrote:
In article , says... On Wed, 28 Dec 2016 23:21:52 -0000, Ralph Mowery wrote: Don't forget that there is no perfect insulator on earth, so some microscopic current is flowing all the time through the capacitor. So say the nit pickers. What if someone shorts the resistor for a bit? The wire doing the shorting has some very low resistance, not counting the wires from the source fo the voltage. Just as there is no perfect insulator, there is no perfect conductor. Then pre charge the capacitor with a bigger load. It is possible to make the capacitor and the battery have precisely the same voltage. Try to keep up. Even if it was possible to count the number of electrons in the capacitor and make them equal to the voltage source, the dielectric in the capacitor will let a few electrons pass, creating some current when it is hooked up. Ever heard of the word negligible? -- California lawmakers are now proposing an amendment that would allow 14 year olds a quarter vote and 16 year olds a half a vote in all state elections. How stupid is this? Don't they have enough trouble counting WHOLE votes? How are they going to figure out fractions?! |
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Switchable Wall Outlet
On Wednesday, December 28, 2016 at 5:47:10 PM UTC-5, Ralph Mowery wrote:
In article , says... And Ohms Law still applies and works. V = IR. I=0, gives V =0, the voltage drop across the conductors is zero. Nor was there any division by zero, so don't start in with that again, please. I wouldn't dream of it, but given I=0 and nothing else, you can't nail down V nor can you nail down R by using Ohm's Law. Ohm's Law does *not* There is always some current flowing. It may only be a couple of electrons and not detectable by any common means. In the simple circuit where there is a switch and the insulation is several inches between conductors when the switch is in the off position, there is still a very , very small current flow across a very large resistance. Therefor as they say 99 and 44/100 % of the voltage is dropped across the switch when it is in the open position. All of this is picking the nits off the nits. I agree, but it's Rafter's specialty. So ther is never a 0 in the equation. Even in the ideal case, where there is zero current flow, Ohm's Law, Kirchoff's Voltage Law, still work. For some bizarre reason, Rafters claims that when we have V = IR, if I is zero, some law of mathematics involving division by zero is violated, so we can't solve for V. Everyone else here agrees we can and the answer is zero. What any of this has to do with wiring a switch, IDK, but here we are. |
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Switchable Wall Outlet
On Wednesday, December 28, 2016 at 5:54:11 PM UTC-5, Ralph Mowery wrote:
In article , says... Voltage drop does not refer to energy lost or to dissipation. Take a capacitor and a resistor in series with a voltage source. urn on the voltage source. Initially, all the voltage drop is across the resistor, it's equal to the source voltage. As the cap charges, there will be voltage drop across the cap, and less across the resistor. Add them up and they will equal the source voltage. This is Kirchoff's voltage law, the sum of all the voltage drops around the circuit must equal zero. When the cap is fully charged, there will be a voltage drop across it and it will equal the source. There is no current flowing, no power dissipation, but Kirchoff's Law still works. The capacitor will never fully charge. Theoretically, in the ideal capacitor case, that's true. But it doesn't have to fully charge for my example to be correct. Rafters claimed voltage drop is about energy loss, dissipation. There is voltage drop across that cap, starting from 0 and asymptotically approaching the value of the voltage source over time and it does not involve energy loss or dissipation. |
#300
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Switchable Wall Outlet
On Wednesday, December 28, 2016 at 6:17:46 PM UTC-5, FromTheRafters wrote:
James Wilkinson Sword submitted this idea : On Wed, 28 Dec 2016 21:08:19 -0000, FromTheRafters wrote: After serious thinking James Wilkinson Sword wrote : On Wed, 28 Dec 2016 20:19:47 -0000, Tony944 wrote: "Uncle Monster" wrote in message ... On Thursday, December 22, 2016 at 5:37:53 PM UTC-6, James Wilkinson Sword wrote: On Thu, 22 Dec 2016 19:57:23 -0000, Dave C wrote: I have an AC wall socket, currently controlled by a wall switch. I would like to change that outlet, so the one of the plugs is always ON. The other plug would remaqin as is, ergo controlled by the wall switch. I purchased a prior house with that configuartion for one socket. Alas I never looked to see how that "split" outlet configuration was implemented. Can one inform me, how to make this change? Thanks What century are you living in? All my sockets have switches on them. You do know that North American wiring standards, voltages and frequency of normal AC power for homes. business and industry are quite different from those of Europe? Your inductive hum is lower and more masculine. I suppose that's a point of pride for you. ヽ(ヅ)ノ [8~{} Uncle Humming Monster It seems to me that some of you guys trying to sale your knowledge here, which in my opinion is very poor. Person must have common sense in any line of work and when you are ask question Simplicity is the right answer not what degree you have or what the Ohms law is, these days you learn that in third grade of school. Regarding school it is not always how much of education have but do you know how to use it. There are many people that have College Degrees but are sweeping floors because are; incapable putting education in use! Another subject there is many different Transformers, Most common is iron core, that could be made of row iron stocked pieces that makes the core and it is use up too 400 Hrz. Presently we have ferret iron cores transformers that will work into very high Frequency depend on density of iron/material that core is made of, it has became very popular. Then we have Air core which is use in High frequency including Micro wave. Voltage drops at 50or 60 Hrz. virtually dont exist in open circuit unless you are running mile and miles of line. In normal use on open line if there or no load/current there is no Voltage drop, you must have current present to have Voltage drop. In radio Frequency there are voltages drops example you radio Antenna can be an open circuit there are current and voltage drop present when transmitter is on! My question is why would I go into electrical theory to some one that wants to know how or can he change duplex receptacle from single source to double supply??? Unless he is trying too empress "us"; Stupid. Yes it is needless to say Stupid The voltage always drops somewhere. In open circuit, it's across the gap. No, it is not. The voltage across the gap (or cap) is the supply voltage. If the voltage across the gap was less than the supply voltage, as it would be when still charging, then you would have a drop somewhere (the conductors). There is no current through the gap (or cap) at all, and no dissipation, even when charging, and therefore no voltage drop across it. This appears to be a philosophical argument. Not philosophical so much as unimportant to the jobs done by electrical engineers. Say what? Basic electrical principles are not relevant to the work done by EEs? People can use computers just fine without knowing how they work, and the same goes for electrical circuit theory and electrical work and those who use calculus and the mathematics behind it. As I see it, you have say 240 volts at the supply, and that voltage is dropped as you go round the circuit. It could be 10 volts across some wires, and 230 across a heating element. When it's switched off, all the drop is across the switch. I'm not suggesting that there is no difference of potential across the switch, I am saying that the difference of potential across the switch is not there because of dissipation. Heat is not the only way that energy can be dissipated, but it *is* the usual one. Wandering in the wilderness again. Emphasis asterisks are added by me. "Voltage drop describes how energy is supplied of a voltage source that is reduced *as electric current moves through the passive elements (elements that do not supply voltage) of an electrical circuit*. Voltage drops across internal resistances of the source, across conductors, across contacts, and across connectors are undesired as the supplied energy is lost (dissipated). Voltage drops across loads and across other active circuit elements are desired as the supplied energy performs useful work. From: https://en.wikipedia.org/wiki/Voltage_drop "Dissipation Energy "The conversion of mechanical energy into heat is called energy dissipation." François Roddier[1] *The term is also applied to the loss of energy due to generation of unwanted heat in electric and electronic circuits*." From: https://en.wikipedia.org/wiki/Dissipation and "An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces *through which electric current can flow*." From: https://en.wikipedia.org/wiki/Electronic_circuit Electric current can't flow when the switch is open, and it is no longer a *circuit* by the definition used in circuit theory. Even when the switch replaced by a capacitor and the capacitor is charging, no current flows through the capacitor. That's technically true, but the result is the same as if the current was flowing through the capacitor. There is no dissipation in the capacitor due to the no current condition, and hence no voltage drop across the capacitor. Wrong again. From your own reference, wiki, on voltage drop: "Analogous to Ohm's law for direct-current circuits, electrical impedance may be expressed by the formula {\displaystyle E=IZ} E=IZ. So, the voltage drop in an AC circuit is the product of the current and the impedance of the circuit." Bingo! Hence, there is voltage drop across the capacitor, it follows Ohm's LAw applied to it's impedance. There has to be voltage drop otherwise Kirchoff's Law would not work. Put a volt meter across a resistor in a circuit, you can see a voltage. It's the voltage drop across the resistor. Put a volt meter across a capacitor or inductor in a circuit and you will also see it's voltage drop. The fact that in one element it's simple resistance, the other it;s impedance, doesn't change the fact that all those voltage drops around the circuit have to add up to zero. And if the no current condition is what gives us the no "dissipation" and then no voltage drop, then how do you explain an inductor? Current flows through an inductor, but an inductor, like a cap, doesn't dissipate energy either. The simple answer is that the voltage drop across both is defined by their impedance and the current flowing through them. Ohm's Law, Kirchoff's Law work, you treat them as impedances. It is easy to misunderstand concepts when one throws out word meanings as 'merely semantics'. Not that you have done so to the best of my recollection, but others sure have. If one doesn't 'pick nits' they can often lose subtle underpinnings of complex concepts. You're the one who totally misunderstands concepts. You're even here lecturing us about using the term "current flow", claiming that it's actually electrons that are flowing. As if we don't all know that. Good grief, please just stop already. |
#301
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Switchable Wall Outlet
On Thu, 29 Dec 2016 00:55:38 -0000, trader_4 wrote:
On Wednesday, December 28, 2016 at 6:17:46 PM UTC-5, FromTheRafters wrote: James Wilkinson Sword submitted this idea : On Wed, 28 Dec 2016 21:08:19 -0000, FromTheRafters wrote: After serious thinking James Wilkinson Sword wrote : On Wed, 28 Dec 2016 20:19:47 -0000, Tony944 wrote: "Uncle Monster" wrote in message ... On Thursday, December 22, 2016 at 5:37:53 PM UTC-6, James Wilkinson Sword wrote: On Thu, 22 Dec 2016 19:57:23 -0000, Dave C wrote: I have an AC wall socket, currently controlled by a wall switch. I would like to change that outlet, so the one of the plugs is always ON. The other plug would remaqin as is, ergo controlled by the wall switch. I purchased a prior house with that configuartion for one socket. Alas I never looked to see how that "split" outlet configuration was implemented. Can one inform me, how to make this change? Thanks What century are you living in? All my sockets have switches on them. You do know that North American wiring standards, voltages and frequency of normal AC power for homes. business and industry are quite different from those of Europe? Your inductive hum is lower and more masculine. I suppose that's a point of pride for you. ヽ(ヅ)ノ [8~{} Uncle Humming Monster It seems to me that some of you guys trying to sale your knowledge here, which in my opinion is very poor. Person must have common sense in any line of work and when you are ask question Simplicity is the right answer not what degree you have or what the Ohms law is, these days you learn that in third grade of school. Regarding school it is not always how much of education have but do you know how to use it. There are many people that have College Degrees but are sweeping floors because are; incapable putting education in use! Another subject there is many different Transformers, Most common is iron core, that could be made of row iron stocked pieces that makes the core and it is use up too 400 Hrz. Presently we have ferret iron cores transformers that will work into very high Frequency depend on density of iron/material that core is made of, it has became very popular. Then we have Air core which is use in High frequency including Micro wave. Voltage drops at 50or 60 Hrz. virtually dont exist in open circuit unless you are running mile and miles of line. In normal use on open line if there or no load/current there is no Voltage drop, you must have current present to have Voltage drop. In radio Frequency there are voltages drops example you radio Antenna can be an open circuit there are current and voltage drop present when transmitter is on! My question is why would I go into electrical theory to some one that wants to know how or can he change duplex receptacle from single source to double supply??? Unless he is trying too empress "us"; Stupid. Yes it is needless to say Stupid The voltage always drops somewhere. In open circuit, it's across the gap. No, it is not. The voltage across the gap (or cap) is the supply voltage. If the voltage across the gap was less than the supply voltage, as it would be when still charging, then you would have a drop somewhere (the conductors). There is no current through the gap (or cap) at all, and no dissipation, even when charging, and therefore no voltage drop across it. This appears to be a philosophical argument. Not philosophical so much as unimportant to the jobs done by electrical engineers. Say what? Basic electrical principles are not relevant to the work done by EEs? People can use computers just fine without knowing how they work, and the same goes for electrical circuit theory and electrical work and those who use calculus and the mathematics behind it. As I see it, you have say 240 volts at the supply, and that voltage is dropped as you go round the circuit. It could be 10 volts across some wires, and 230 across a heating element. When it's switched off, all the drop is across the switch. I'm not suggesting that there is no difference of potential across the switch, I am saying that the difference of potential across the switch is not there because of dissipation. Heat is not the only way that energy can be dissipated, but it *is* the usual one. Wandering in the wilderness again. Emphasis asterisks are added by me. "Voltage drop describes how energy is supplied of a voltage source that is reduced *as electric current moves through the passive elements (elements that do not supply voltage) of an electrical circuit*. Voltage drops across internal resistances of the source, across conductors, across contacts, and across connectors are undesired as the supplied energy is lost (dissipated). Voltage drops across loads and across other active circuit elements are desired as the supplied energy performs useful work. From: https://en.wikipedia.org/wiki/Voltage_drop "Dissipation Energy "The conversion of mechanical energy into heat is called energy dissipation." François Roddier[1] *The term is also applied to the loss of energy due to generation of unwanted heat in electric and electronic circuits*." From: https://en.wikipedia.org/wiki/Dissipation and "An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces *through which electric current can flow*." From: https://en.wikipedia.org/wiki/Electronic_circuit Electric current can't flow when the switch is open, and it is no longer a *circuit* by the definition used in circuit theory. Even when the switch replaced by a capacitor and the capacitor is charging, no current flows through the capacitor. That's technically true, but the result is the same as if the current was flowing through the capacitor. There is no dissipation in the capacitor due to the no current condition, and hence no voltage drop across the capacitor. Wrong again. From your own reference, wiki, on voltage drop: "Analogous to Ohm's law for direct-current circuits, electrical impedance may be expressed by the formula {\displaystyle E=IZ} E=IZ. So, the voltage drop in an AC circuit is the product of the current and the impedance of the circuit." Bingo! Hence, there is voltage drop across the capacitor, it follows Ohm's LAw applied to it's impedance. There has to be voltage drop otherwise Kirchoff's Law would not work. Put a volt meter across a resistor in a circuit, you can see a voltage. It's the voltage drop across the resistor. Put a volt meter across a capacitor or inductor in a circuit and you will also see it's voltage drop. The fact that in one element it's simple resistance, the other it;s impedance, doesn't change the fact that all those voltage drops around the circuit have to add up to zero. And if the no current condition is what gives us the no "dissipation" and then no voltage drop, then how do you explain an inductor? Current flows through an inductor, but an inductor, like a cap, doesn't dissipate energy either. The simple answer is that the voltage drop across both is defined by their impedance and the current flowing through them. Ohm's Law, Kirchoff's Law work, you treat them as impedances. It is easy to misunderstand concepts when one throws out word meanings as 'merely semantics'. Not that you have done so to the best of my recollection, but others sure have. If one doesn't 'pick nits' they can often lose subtle underpinnings of complex concepts. You're the one who totally misunderstands concepts. You're even here lecturing us about using the term "current flow", claiming that it's actually electrons that are flowing. As if we don't all know that. Good grief, please just stop already. I think "FromTheRafters"'s head is up in the rafters in a daydream. -- 23% of all photocopier faults worldwide are caused by people sitting on them and photocopying their buttocks. |
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Switchable Wall Outlet
Ralph Mowery formulated the question :
In article , says... And Ohms Law still applies and works. V = IR. I=0, gives V =0, the voltage drop across the conductors is zero. Nor was there any division by zero, so don't start in with that again, please. I wouldn't dream of it, but given I=0 and nothing else, you can't nail down V nor can you nail down R by using Ohm's Law. Ohm's Law does *not* There is always some current flowing. Yes, gfretwell mentioned this already and I knew this already. This is why Ohm's Law works as well as it does. However, when someone stipulates that the current *is* zero, it means he is talking theory if you go by what you just mentioned about reality. I objected to the assumed correctness of the statement, and the argument ensued. It may only be a couple of electrons and not detectable by any common means. In the simple circuit where there is a switch and the insulation is several inches between conductors when the switch is in the off position, there is still a very , very small current flow across a very large resistance. Therefor as they say 99 and 44/100 % of the voltage is dropped across the switch when it is in the open position. That argument 'floats'. You don't even need to use limits when you state a current (or resistance) is close to zero and apply Ohm's Law. The algebra used to derive the three equations which make up the Ohm's Law formula requires that I and R be non-zero. All of this is picking the nits off the nits. Perhaps, but it is 'on topic' nitpicking. And I didn't start it, I only mentioned that a certain statement was incorrect IMO. There was really no need to argue the point, but they apparently wanted to. I don't mind defending my point of view, and don't back down just because they decide to call me names either. So ther is never a 0 in the equation. You just have to look very hard to find the components. I agree. Mr. Ohm himself wasn't using open circuits when he made his empirical observations. He had a meter and a source and he put differing lengths of assorted materials in a 'circuit' and observed the results. When scientists wanted to see if Ohm's Law worked at very small scales, they didn't construct a four atom wide conductor and leave it isolated and say "Zero amps, and zero volts, yep - it still works" either. |
#303
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Switchable Wall Outlet
trader_4 used his keyboard to write :
On Wednesday, December 28, 2016 at 5:47:10 PM UTC-5, Ralph Mowery wrote: In article , says... And Ohms Law still applies and works. V = IR. I=0, gives V =0, the voltage drop across the conductors is zero. Nor was there any division by zero, so don't start in with that again, please. I wouldn't dream of it, but given I=0 and nothing else, you can't nail down V nor can you nail down R by using Ohm's Law. Ohm's Law does *not* There is always some current flowing. It may only be a couple of electrons and not detectable by any common means. In the simple circuit where there is a switch and the insulation is several inches between conductors when the switch is in the off position, there is still a very , very small current flow across a very large resistance. Therefor as they say 99 and 44/100 % of the voltage is dropped across the switch when it is in the open position. All of this is picking the nits off the nits. I agree, but it's Rafter's specialty. So ther is never a 0 in the equation. Even in the ideal case, where there is zero current flow, Ohm's Law, Kirchoff's Voltage Law, still work. For some bizarre reason, Rafters claims that when we have V = IR, if I is zero, some law of mathematics involving division by zero is violated, so we can't solve for V. Everyone else here agrees we can and the answer is zero. You can't know that *everyone* agrees until *everyone* says so, and I don't mean someone using "everyone" as a nym either. What any of this has to do with wiring a switch, IDK, but here we are. You should be able to stop at any time, but you can't can you? The reason this switch thread devolved into this is because of your remark about electrical engineers not being worth their salt if they don't know about some minutia about cutting a plate on a duplex receptacle. https://dengarden.com/home-improveme...alf-hot-outlet Instead of helping the poster, you decided to attempt to make yourself look better than him (as you almost always do) by denigrating him and the place he got his degree from. IMO he learned a good deal more about the subject than you did, and put it to use in a much more complicated field. |
#304
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Switchable Wall Outlet
trader_4 wrote on 12/28/2016 :
On Wednesday, December 28, 2016 at 4:33:37 PM UTC-5, James Wilkinson Sword wrote: On Wed, 28 Dec 2016 21:08:19 -0000, FromTheRafters wrote: After serious thinking James Wilkinson Sword wrote : On Wed, 28 Dec 2016 20:19:47 -0000, Tony944 wrote: "Uncle Monster" wrote in message ... On Thursday, December 22, 2016 at 5:37:53 PM UTC-6, James Wilkinson Sword wrote: On Thu, 22 Dec 2016 19:57:23 -0000, Dave C wrote: I have an AC wall socket, currently controlled by a wall switch. I would like to change that outlet, so the one of the plugs is always ON. The other plug would remaqin as is, ergo controlled by the wall switch. I purchased a prior house with that configuartion for one socket. Alas I never looked to see how that "split" outlet configuration was implemented. Can one inform me, how to make this change? Thanks What century are you living in? All my sockets have switches on them. You do know that North American wiring standards, voltages and frequency of normal AC power for homes. business and industry are quite different from those of Europe? Your inductive hum is lower and more masculine. I suppose that's a point of pride for you. ヽ(ヅ)ノ [8~{} Uncle Humming Monster It seems to me that some of you guys trying to sale your knowledge here, which in my opinion is very poor. Person must have common sense in any line of work and when you are ask question Simplicity is the right answer not what degree you have or what the Ohms law is, these days you learn that in third grade of school. Regarding school it is not always how much of education have but do you know how to use it. There are many people that have College Degrees but are sweeping floors because are; incapable putting education in use! Another subject there is many different Transformers, Most common is iron core, that could be made of row iron stocked pieces that makes the core and it is use up too 400 Hrz. Presently we have ferret iron cores transformers that will work into very high Frequency depend on density of iron/material that core is made of, it has became very popular. Then we have Air core which is use in High frequency including Micro wave. Voltage drops at 50or 60 Hrz. virtually dont exist in open circuit unless you are running mile and miles of line. In normal use on open line if there or no load/current there is no Voltage drop, you must have current present to have Voltage drop. In radio Frequency there are voltages drops example you radio Antenna can be an open circuit there are current and voltage drop present when transmitter is on! My question is why would I go into electrical theory to some one that wants to know how or can he change duplex receptacle from single source to double supply??? Unless he is trying too empress "us"; Stupid. Yes it is needless to say Stupid The voltage always drops somewhere. In open circuit, it's across the gap. No, it is not. The voltage across the gap (or cap) is the supply voltage. If the voltage across the gap was less than the supply voltage, as it would be when still charging, then you would have a drop somewhere (the conductors). There is no current through the gap (or cap) at all, and no dissipation, even when charging, and therefore no voltage drop across it. This appears to be a philosophical argument. As I see it, you have say 240 volts at the supply, and that voltage is dropped as you go round the circuit. It could be 10 volts across some wires, and 230 across a heating element. When it's switched off, all the drop is across the switch. -- A group of white South Africans recently killed a black lawyer because he was black. That was wrong. They should have killed him because he was a lawyer. Don't forget that Rafters came up with this gem: With no power, you have no voltage drop. This is because voltage drop refers to the energy lost mainly through dissipation which happens when there *is* charge flowing through a resistance. No current, no voltage drop. Voltage drop does not refer to energy lost or to dissipation. Take a capacitor and a resistor in series with a voltage source. urn on the voltage source. Initially, all the voltage drop is across the resistor, it's equal to the source voltage. As the cap charges, there will be voltage drop across the cap, and less across the resistor. Add them up and they will equal the source voltage. This is Kirchoff's voltage law, the sum of all the voltage drops around the circuit must equal zero. When the cap is fully charged, there will be a voltage drop across it and it will equal the source. There is no current flowing, no power dissipation, but Kirchoff's Law still works. Hell, you can't even spell it right. Show me the capacitors. https://en.wikipedia.org/wiki/Kirchhoff's_circuit_laws |
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Switchable Wall Outlet
Ralph Mowery pretended :
In article , says... Voltage drop does not refer to energy lost or to dissipation. Take a capacitor and a resistor in series with a voltage source. urn on the voltage source. Initially, all the voltage drop is across the resistor, it's equal to the source voltage. As the cap charges, there will be voltage drop across the cap, and less across the resistor. Add them up and they will equal the source voltage. This is Kirchoff's voltage law, the sum of all the voltage drops around the circuit must equal zero. When the cap is fully charged, there will be a voltage drop across it and it will equal the source. There is no current flowing, no power dissipation, but Kirchoff's Law still works. The capacitor will never fully charge. There is a time constant where the capacitor charges to about 63.2 % . Usually 5 time constants are concidered fully charged, but it never reaches a true full charge. Don't forget that there is no perfect insulator on earth, so some microscopic current is flowing all the time through the capacitor. So say the nit pickers. As long as we are back in the real world, my stipulation about ideal voltage source and ideal capacitor is gone. I never argued about the real world circuits. http://www.allaboutcircuits.com/text...acitor-quirks/ https://en.wikipedia.org/wiki/Voltage_source |
#306
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Switchable Wall Outlet
trader_4 formulated on Wednesday :
On Wednesday, December 28, 2016 at 6:17:46 PM UTC-5, FromTheRafters wrote: James Wilkinson Sword submitted this idea : On Wed, 28 Dec 2016 21:08:19 -0000, FromTheRafters wrote: After serious thinking James Wilkinson Sword wrote : On Wed, 28 Dec 2016 20:19:47 -0000, Tony944 wrote: "Uncle Monster" wrote in message ... On Thursday, December 22, 2016 at 5:37:53 PM UTC-6, James Wilkinson Sword wrote: On Thu, 22 Dec 2016 19:57:23 -0000, Dave C wrote: I have an AC wall socket, currently controlled by a wall switch. I would like to change that outlet, so the one of the plugs is always ON. The other plug would remaqin as is, ergo controlled by the wall switch. I purchased a prior house with that configuartion for one socket. Alas I never looked to see how that "split" outlet configuration was implemented. Can one inform me, how to make this change? Thanks What century are you living in? All my sockets have switches on them. You do know that North American wiring standards, voltages and frequency of normal AC power for homes. business and industry are quite different from those of Europe? Your inductive hum is lower and more masculine. I suppose that's a point of pride for you. ヽ(ヅ)ノ [8~{} Uncle Humming Monster It seems to me that some of you guys trying to sale your knowledge here, which in my opinion is very poor. Person must have common sense in any line of work and when you are ask question Simplicity is the right answer not what degree you have or what the Ohms law is, these days you learn that in third grade of school. Regarding school it is not always how much of education have but do you know how to use it. There are many people that have College Degrees but are sweeping floors because are; incapable putting education in use! Another subject there is many different Transformers, Most common is iron core, that could be made of row iron stocked pieces that makes the core and it is use up too 400 Hrz. Presently we have ferret iron cores transformers that will work into very high Frequency depend on density of iron/material that core is made of, it has became very popular. Then we have Air core which is use in High frequency including Micro wave. Voltage drops at 50or 60 Hrz. virtually dont exist in open circuit unless you are running mile and miles of line. In normal use on open line if there or no load/current there is no Voltage drop, you must have current present to have Voltage drop. In radio Frequency there are voltages drops example you radio Antenna can be an open circuit there are current and voltage drop present when transmitter is on! My question is why would I go into electrical theory to some one that wants to know how or can he change duplex receptacle from single source to double supply??? Unless he is trying too empress "us"; Stupid. Yes it is needless to say Stupid The voltage always drops somewhere. In open circuit, it's across the gap. No, it is not. The voltage across the gap (or cap) is the supply voltage. If the voltage across the gap was less than the supply voltage, as it would be when still charging, then you would have a drop somewhere (the conductors). There is no current through the gap (or cap) at all, and no dissipation, even when charging, and therefore no voltage drop across it. This appears to be a philosophical argument. Not philosophical so much as unimportant to the jobs done by electrical engineers. Say what? Basic electrical principles are not relevant to the work done by EEs? People can use computers just fine without knowing how they work, and the same goes for electrical circuit theory and electrical work and those who use calculus and the mathematics behind it. As I see it, you have say 240 volts at the supply, and that voltage is dropped as you go round the circuit. It could be 10 volts across some wires, and 230 across a heating element. When it's switched off, all the drop is across the switch. I'm not suggesting that there is no difference of potential across the switch, I am saying that the difference of potential across the switch is not there because of dissipation. Heat is not the only way that energy can be dissipated, but it *is* the usual one. Wandering in the wilderness again. Emphasis asterisks are added by me. "Voltage drop describes how energy is supplied of a voltage source that is reduced *as electric current moves through the passive elements (elements that do not supply voltage) of an electrical circuit*. Voltage drops across internal resistances of the source, across conductors, across contacts, and across connectors are undesired as the supplied energy is lost (dissipated). Voltage drops across loads and across other active circuit elements are desired as the supplied energy performs useful work. From: https://en.wikipedia.org/wiki/Voltage_drop "Dissipation Energy "The conversion of mechanical energy into heat is called energy dissipation." François Roddier[1] *The term is also applied to the loss of energy due to generation of unwanted heat in electric and electronic circuits*." From: https://en.wikipedia.org/wiki/Dissipation and "An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces *through which electric current can flow*." From: https://en.wikipedia.org/wiki/Electronic_circuit Electric current can't flow when the switch is open, and it is no longer a *circuit* by the definition used in circuit theory. Even when the switch replaced by a capacitor and the capacitor is charging, no current flows through the capacitor. That's technically true, but the result is the same as if the current was flowing through the capacitor. There is no dissipation in the capacitor due to the no current condition, and hence no voltage drop across the capacitor. Wrong again. From your own reference, wiki, on voltage drop: "Analogous to Ohm's law for direct-current circuits, electrical impedance may be expressed by the formula {\displaystyle E=IZ} E=IZ. So, the voltage drop in an AC circuit is the product of the current and the impedance of the circuit." Bingo! Hence, there is voltage drop across the capacitor, it follows Ohm's LAw applied to it's impedance. There has to be voltage drop otherwise Kirchoff's Law would not work. Put a volt meter across a resistor in a circuit, you can see a voltage. It's the voltage drop across the resistor. Put a volt meter across a capacitor or inductor in a circuit and you will also see it's voltage drop. The fact that in one element it's simple resistance, the other it;s impedance, doesn't change the fact that all those voltage drops around the circuit have to add up to zero. And if the no current condition is what gives us the no "dissipation" and then no voltage drop, then how do you explain an inductor? Current flows through an inductor, but an inductor, like a cap, doesn't dissipate energy either. The simple answer is that the voltage drop across both is defined by their impedance and the current flowing through them. Ohm's Law, Kirchoff's Law work, you treat them as impedances. It is easy to misunderstand concepts when one throws out word meanings as 'merely semantics'. Not that you have done so to the best of my recollection, but others sure have. If one doesn't 'pick nits' they can often lose subtle underpinnings of complex concepts. You're the one who totally misunderstands concepts. You're even here lecturing us about using the term "current flow", claiming that it's actually electrons that are flowing. It's a common misconception, and just by convention the word current is used with flow to simplify things. I mentioned it in passing. It just seemed to you like a lecture because you probably had to look it up. As if we don't all know that. Good grief, please just stop already. You seem to be having trouble with the word analogous now while trying to move the goalposts. IMO, they should refer to that 'voltage drop' as 'reactive voltage drop' like they do with all of the other AC terms that are not related to purely resistive devices. Anyway, we weren't discussing an analog to Ohm's Law and reactance. I only used the capacitor as a way to slow down the act of opening the switch and having the current start high and approach zero instead of suddenly just being zero for demonstration purposes. It made it easier to see the trend and the mathematical discontinuity. I'll stop now as you seem to be getting overly emotional. |
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On 12/22/2016 11:57 AM, Dave C wrote:
I have an AC wall socket, currently controlled by a wall switch. I would like to change that outlet, so the one of the plugs is always ON. The other plug would remaqin as is, ergo controlled by the wall switch. I purchased a prior house with that configuartion for one socket. Alas I never looked to see how that "split" outlet configuration was implemented. Can one inform me, how to make this change? Thanks Call an electrician. |
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On Thu, 29 Dec 2016 02:18:26 -0000, FromTheRafters wrote:
trader_4 wrote on 12/28/2016 : On Wednesday, December 28, 2016 at 4:33:37 PM UTC-5, James Wilkinson Sword wrote: On Wed, 28 Dec 2016 21:08:19 -0000, FromTheRafters wrote: After serious thinking James Wilkinson Sword wrote : On Wed, 28 Dec 2016 20:19:47 -0000, Tony944 wrote: "Uncle Monster" wrote in message ... On Thursday, December 22, 2016 at 5:37:53 PM UTC-6, James Wilkinson Sword wrote: On Thu, 22 Dec 2016 19:57:23 -0000, Dave C wrote: I have an AC wall socket, currently controlled by a wall switch.. I would like to change that outlet, so the one of the plugs is always ON. The other plug would remaqin as is, ergo controlled by the wall switch. I purchased a prior house with that configuartion for one socket. Alas I never looked to see how that "split" outlet configuration was implemented. Can one inform me, how to make this change? Thanks What century are you living in? All my sockets have switches on them. You do know that North American wiring standards, voltages and frequency of normal AC power for homes. business and industry are quite different from those of Europe? Your inductive hum is lower and more masculine. I suppose that's a point of pride for you. ヽ(ヅ)ノ [8~{} Uncle Humming Monster It seems to me that some of you guys trying to sale your knowledge here, which in my opinion is very poor. Person must have common sense in any line of work and when you are ask question Simplicity is the right answer not what degree you have or what the Ohms law is, these days you learn that in third grade of school. Regarding school it is not always how much of education have but do you know how to use it. There are many people that have College Degrees but are sweeping floors because are; incapable putting education in use! Another subject there is many different Transformers, Most common is iron core, that could be made of row iron stocked pieces that makes the core and it is use up too 400 Hrz. Presently we have ferret iron cores transformers that will work into very high Frequency depend on density of iron/material that core is made of, it has became very popular. Then we have Air core which is use in High frequency including Micro wave.. Voltage drops at 50or 60 Hrz. virtually dont exist in open circuit unless you are running mile and miles of line. In normal use on open line if there or no load/current there is no Voltage drop, you must have current present to have Voltage drop. In radio Frequency there are voltages drops example you radio Antenna can be an open circuit there are current and voltage drop present when transmitter is on! My question is why would I go into electrical theory to some one that wants to know how or can he change duplex receptacle from single source to double supply??? Unless he is trying too empress "us"; Stupid. Yes it is needless to say Stupid The voltage always drops somewhere. In open circuit, it's across the gap. No, it is not. The voltage across the gap (or cap) is the supply voltage. If the voltage across the gap was less than the supply voltage, as it would be when still charging, then you would have a drop somewhere (the conductors). There is no current through the gap (or cap) at all, and no dissipation, even when charging, and therefore no voltage drop across it. This appears to be a philosophical argument. As I see it, you have say 240 volts at the supply, and that voltage is dropped as you go round the circuit. It could be 10 volts across some wires, and 230 across a heating element. When it's switched off, all the drop is across the switch.. -- A group of white South Africans recently killed a black lawyer because he was black. That was wrong. They should have killed him because he was a lawyer. Don't forget that Rafters came up with this gem: With no power, you have no voltage drop. This is because voltage drop refers to the energy lost mainly through dissipation which happens when there *is* charge flowing through a resistance. No current, no voltage drop. Voltage drop does not refer to energy lost or to dissipation. Take a capacitor and a resistor in series with a voltage source. urn on the voltage source. Initially, all the voltage drop is across the resistor, it's equal to the source voltage. As the cap charges, there will be voltage drop across the cap, and less across the resistor. Add them up and they will equal the source voltage. This is Kirchoff's voltage law, the sum of all the voltage drops around the circuit must equal zero. When the cap is fully charged, there will be a voltage drop across it and it will equal the source. There is no current flowing, no power dissipation, but Kirchoff's Law still works. Hell, you can't even spell it right. Show me the capacitors. https://en.wikipedia.org/wiki/Kirchhoff's_circuit_laws Where does it say you can't use them? -- Why isn't there mouse-flavored cat food? |
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On Wednesday, December 28, 2016 at 8:51:01 PM UTC-5, FromTheRafters wrote:
Ralph Mowery formulated the question : In article , says... And Ohms Law still applies and works. V = IR. I=0, gives V =0, the voltage drop across the conductors is zero. Nor was there any division by zero, so don't start in with that again, please. I wouldn't dream of it, but given I=0 and nothing else, you can't nail down V nor can you nail down R by using Ohm's Law. Ohm's Law does *not* There is always some current flowing. Yes, gfretwell mentioned this already and I knew this already. This is why Ohm's Law works as well as it does. Ohm's law works with zero current flowing: V = IR I = 0, what is V? Answer from everyone else here, V = 0 However, when someone stipulates that the current *is* zero, it means he is talking theory if you go by what you just mentioned about reality. I objected to the assumed correctness of the statement, and the argument ensued. A current of zero in a circuit is not "theory". It may only be a couple of electrons and not detectable by any common means. In the simple circuit where there is a switch and the insulation is several inches between conductors when the switch is in the off position, there is still a very , very small current flow across a very large resistance. Therefor as they say 99 and 44/100 % of the voltage is dropped across the switch when it is in the open position. That argument 'floats'. You don't even need to use limits when you state a current (or resistance) is close to zero and apply Ohm's Law. The algebra used to derive the three equations which make up the Ohm's Law formula requires that I and R be non-zero. Complete bull ****. All of this is picking the nits off the nits. Perhaps, but it is 'on topic' nitpicking. And I didn't start it, I only mentioned that a certain statement was incorrect IMO. There was really no need to argue the point, but they apparently wanted to. I don't mind defending my point of view, and don't back down just because they decide to call me names either. So ther is never a 0 in the equation. You just have to look very hard to find the components. I agree. Mr. Ohm himself wasn't using open circuits when he made his empirical observations. Where you there? He had a meter and a source and he put differing lengths of assorted materials in a 'circuit' and observed the results. When scientists wanted to see if Ohm's Law worked at very small scales, they didn't construct a four atom wide conductor and leave it isolated and say "Zero amps, and zero volts, yep - it still works" either. And Ohm's Law works for zero current. And it works for impedances too, another concept you completely fail to grasp. |
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On Wednesday, December 28, 2016 at 9:13:50 PM UTC-5, FromTheRafters wrote:
trader_4 used his keyboard to write : On Wednesday, December 28, 2016 at 5:47:10 PM UTC-5, Ralph Mowery wrote: In article , says... And Ohms Law still applies and works. V = IR. I=0, gives V =0, the voltage drop across the conductors is zero. Nor was there any division by zero, so don't start in with that again, please. I wouldn't dream of it, but given I=0 and nothing else, you can't nail down V nor can you nail down R by using Ohm's Law. Ohm's Law does *not* There is always some current flowing. It may only be a couple of electrons and not detectable by any common means. In the simple circuit where there is a switch and the insulation is several inches between conductors when the switch is in the off position, there is still a very , very small current flow across a very large resistance. Therefor as they say 99 and 44/100 % of the voltage is dropped across the switch when it is in the open position. All of this is picking the nits off the nits. I agree, but it's Rafter's specialty. So ther is never a 0 in the equation. Even in the ideal case, where there is zero current flow, Ohm's Law, Kirchoff's Voltage Law, still work. For some bizarre reason, Rafters claims that when we have V = IR, if I is zero, some law of mathematics involving division by zero is violated, so we can't solve for V. Everyone else here agrees we can and the answer is zero. You can't know that *everyone* agrees until *everyone* says so, and I don't mean someone using "everyone" as a nym either. Cite for us the posters that agree with you. Every one I've seen says you're wrong, not that it matters that much, because it doesn't change the laws of physics. What any of this has to do with wiring a switch, IDK, but here we are. You should be able to stop at any time, but you can't can you? The reason this switch thread devolved into this is because of your remark about electrical engineers not being worth their salt if they don't know about some minutia about cutting a plate on a duplex receptacle. Go figure. I simply stated that if you have a degree in electrical engineering, you should be able to understand and solve a simple switch circuit. That's all. Go figure. You started with all the stupid, BS, nit nonsense. Like chastising us for saying "current flow", because, according to you, current does not flow. https://dengarden.com/home-improveme...alf-hot-outlet Instead of helping the poster, you decided to attempt to make yourself look better than him (as you almost always do) by denigrating him and the place he got his degree from. IMO he learned a good deal more about the subject than you did, and put it to use in a much more complicated field. Now you're lying. My comments about what an EE should know were not directed to the OP, who has long since disappeared. The OP's question was immediately answered by DerbyDad, I validated his answer and added that when you re-purpose the white wire as a non-grounded conductor, it needs to be marked at both ends to identify it. BTW, WTF did you add, except a lot of incorrect BS, like arguing about not saying "current flow"? |
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On Wednesday, December 28, 2016 at 5:54:11 PM UTC-5, Ralph Mowery wrote:
In article , says... Voltage drop does not refer to energy lost or to dissipation. Take a capacitor and a resistor in series with a voltage source. urn on the voltage source. Initially, all the voltage drop is across the resistor, it's equal to the source voltage. As the cap charges, there will be voltage drop across the cap, and less across the resistor. Add them up and they will equal the source voltage. This is Kirchoff's voltage law, the sum of all the voltage drops around the circuit must equal zero. When the cap is fully charged, there will be a voltage drop across it and it will equal the source. There is no current flowing, no power dissipation, but Kirchoff's Law still works. The capacitor will never fully charge. It doesn't have to fully charge. The point is that a capacitor doesn't dissipate energy, yet it has a voltage drop across it, just like a resistor has a voltage drop across it. And the sum of all the voltage drops in a circuit must be zero, per Kirchhoff's Law. THAT is what Rafters doesn't get. |
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On Wednesday, December 28, 2016 at 6:55:36 PM UTC-5, James Wilkinson Sword wrote:
On Wed, 28 Dec 2016 23:48:58 -0000, Ralph Mowery wrote: In article , says... On Wed, 28 Dec 2016 23:21:52 -0000, Ralph Mowery wrote: Don't forget that there is no perfect insulator on earth, so some microscopic current is flowing all the time through the capacitor. So say the nit pickers. What if someone shorts the resistor for a bit? The wire doing the shorting has some very low resistance, not counting the wires from the source fo the voltage. Just as there is no perfect insulator, there is no perfect conductor. Then pre charge the capacitor with a bigger load. It is possible to make the capacitor and the battery have precisely the same voltage. Try to keep up. Even if it was possible to count the number of electrons in the capacitor and make them equal to the voltage source, the dielectric in the capacitor will let a few electrons pass, creating some current when it is hooked up. Ever heard of the word negligible? +1 This just keeps going farther and farther into the wilderness. The real problem here is that Rafters does not understand Ohm's Law and Kirchhoff's Laws. He denies there is voltage drop across a capacitor that's in a circuit. |
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On Wednesday, December 28, 2016 at 9:18:30 PM UTC-5, FromTheRafters wrote:
trader_4 wrote on 12/28/2016 : On Wednesday, December 28, 2016 at 4:33:37 PM UTC-5, James Wilkinson Sword wrote: On Wed, 28 Dec 2016 21:08:19 -0000, FromTheRafters wrote: After serious thinking James Wilkinson Sword wrote : On Wed, 28 Dec 2016 20:19:47 -0000, Tony944 wrote: "Uncle Monster" wrote in message ... On Thursday, December 22, 2016 at 5:37:53 PM UTC-6, James Wilkinson Sword wrote: On Thu, 22 Dec 2016 19:57:23 -0000, Dave C wrote: I have an AC wall socket, currently controlled by a wall switch. I would like to change that outlet, so the one of the plugs is always ON. The other plug would remaqin as is, ergo controlled by the wall switch. I purchased a prior house with that configuartion for one socket. Alas I never looked to see how that "split" outlet configuration was implemented. Can one inform me, how to make this change? Thanks What century are you living in? All my sockets have switches on them. You do know that North American wiring standards, voltages and frequency of normal AC power for homes. business and industry are quite different from those of Europe? Your inductive hum is lower and more masculine. I suppose that's a point of pride for you. ヽ(ヅ)ノ [8~{} Uncle Humming Monster It seems to me that some of you guys trying to sale your knowledge here, which in my opinion is very poor. Person must have common sense in any line of work and when you are ask question Simplicity is the right answer not what degree you have or what the Ohms law is, these days you learn that in third grade of school. Regarding school it is not always how much of education have but do you know how to use it. There are many people that have College Degrees but are sweeping floors because are; incapable putting education in use! Another subject there is many different Transformers, Most common is iron core, that could be made of row iron stocked pieces that makes the core and it is use up too 400 Hrz. Presently we have ferret iron cores transformers that will work into very high Frequency depend on density of iron/material that core is made of, it has became very popular. Then we have Air core which is use in High frequency including Micro wave. Voltage drops at 50or 60 Hrz. virtually dont exist in open circuit unless you are running mile and miles of line. In normal use on open line if there or no load/current there is no Voltage drop, you must have current present to have Voltage drop. In radio Frequency there are voltages drops example you radio Antenna can be an open circuit there are current and voltage drop present when transmitter is on! My question is why would I go into electrical theory to some one that wants to know how or can he change duplex receptacle from single source to double supply??? Unless he is trying too empress "us"; Stupid. Yes it is needless to say Stupid The voltage always drops somewhere. In open circuit, it's across the gap. No, it is not. The voltage across the gap (or cap) is the supply voltage. If the voltage across the gap was less than the supply voltage, as it would be when still charging, then you would have a drop somewhere (the conductors). There is no current through the gap (or cap) at all, and no dissipation, even when charging, and therefore no voltage drop across it. This appears to be a philosophical argument. As I see it, you have say 240 volts at the supply, and that voltage is dropped as you go round the circuit. It could be 10 volts across some wires, and 230 across a heating element. When it's switched off, all the drop is across the switch. -- A group of white South Africans recently killed a black lawyer because he was black. That was wrong. They should have killed him because he was a lawyer. Don't forget that Rafters came up with this gem: With no power, you have no voltage drop. This is because voltage drop refers to the energy lost mainly through dissipation which happens when there *is* charge flowing through a resistance. No current, no voltage drop. Voltage drop does not refer to energy lost or to dissipation. Take a capacitor and a resistor in series with a voltage source. urn on the voltage source. Initially, all the voltage drop is across the resistor, it's equal to the source voltage. As the cap charges, there will be voltage drop across the cap, and less across the resistor. Add them up and they will equal the source voltage. This is Kirchoff's voltage law, the sum of all the voltage drops around the circuit must equal zero. When the cap is fully charged, there will be a voltage drop across it and it will equal the source. There is no current flowing, no power dissipation, but Kirchoff's Law still works. Hell, you can't even spell it right. Show me the capacitors. https://en.wikipedia.org/wiki/Kirchhoff's_circuit_laws Let me get this right. You're again denying that Kirchhoff's laws apply to circuits with capacitors? That there is no voltage drop across a cap in a circuit? When your only source for electrical engineering principles is wiki, I can see how you get so ****ed up. Just because wiki only shows an example with resistors for novices like you, doesn't mean the law doesn't apply to circuits with capacitors and inductors too. You really, really need to stop. You're like the guy that brings a slingshot to a gun fight. |
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On Wednesday, December 28, 2016 at 9:29:11 PM UTC-5, FromTheRafters wrote:
Ralph Mowery pretended : In article , says... Voltage drop does not refer to energy lost or to dissipation. Take a capacitor and a resistor in series with a voltage source. urn on the voltage source. Initially, all the voltage drop is across the resistor, it's equal to the source voltage. As the cap charges, there will be voltage drop across the cap, and less across the resistor. Add them up and they will equal the source voltage. This is Kirchoff's voltage law, the sum of all the voltage drops around the circuit must equal zero. When the cap is fully charged, there will be a voltage drop across it and it will equal the source. There is no current flowing, no power dissipation, but Kirchoff's Law still works. The capacitor will never fully charge. There is a time constant where the capacitor charges to about 63.2 % . Usually 5 time constants are concidered fully charged, but it never reaches a true full charge. Don't forget that there is no perfect insulator on earth, so some microscopic current is flowing all the time through the capacitor. So say the nit pickers. As long as we are back in the real world, my stipulation about ideal voltage source and ideal capacitor is gone. I never argued about the real world circuits. Yes you did. You told us that there is no voltage drop across a cap in a real world circuit, because there is no "dissipation", no current flowing. |
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On Wednesday, December 28, 2016 at 10:51:10 PM UTC-5, FromTheRafters wrote:
You're the one who totally misunderstands concepts. You're even here lecturing us about using the term "current flow", claiming that it's actually electrons that are flowing. It's a common misconception, and just by convention the word current is used with flow to simplify things. I mentioned it in passing. It just seemed to you like a lecture because you probably had to look it up. First, let's note that you skipped all the sections where I smashed all your technical nonsense. "I mentioned it in passing". No, you brought it up like you, being the smart one, figured out something that's incorrect. Actually, there is nothing incorrect about referring to current flowing. Try taking a course in electrical engineering and then you can correct the professor and impress the class. ROFL. As if we don't all know that. Good grief, please just stop already. You seem to be having trouble with the word analogous now while trying to move the goalposts. IMO, they should refer to that 'voltage drop' as 'reactive voltage drop' like they do with all of the other AC terms that are not related to purely resistive devices. We really don't care what your opinion is. You don't set the terms, the definitions for EE. Voltage drop is referred to as just that. The vast majority of the time, we don't need to specify whether it's purely resistive or there is a reactance component. Even novices know that if it's an ideal cap or inductor, then it's purely reactance. Maybe YOU need it explained each time though. Anyway, we weren't discussing an analog to Ohm's Law and reactance. We are now, because it's one way to smash your BS. I only used the capacitor as a way to slow down the act of opening the switch and having the current start high and approach zero instead of suddenly just being zero for demonstration purposes. It made it easier to see the trend and the mathematical discontinuity. I'll stop now as you seem to be getting overly emotional. You should have stopped a long time ago, because you're just embarrassing yourself. That BS about the term "current flow" not being right to use, that to solve V = IR for I =0 requires division by zero, those alone were way more than enough. |
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On Thursday, December 29, 2016 at 11:10:11 AM UTC-5, James Wilkinson Sword
Show me the capacitors. https://en.wikipedia.org/wiki/Kirchhoff's_circuit_laws Where does it say you can't use them? Exactly. It doesn't say it's limited to resistors, but apparently Rafters thinks so, because they only show a simple example with resistors. Better than that, Rafters own wiki reference says: "KCL is applicable to any lumped network irrespective of the nature of the network; whether unilateral or bilateral, active or passive, linear or non-linear." The above references only his current law, but it applies equally to his voltage law. A quick check of any credible electrical engineering course work will confirm that: http://people.clarkson.edu/~jsvoboda...aws_foc_ac.pdf Wow, caps and inductors too! What now, Rafters? How can that be? I mean, this is so, so dumb, IDK why he keeps embarrassing himself. |
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James Wilkinson Sword brought next idea :
I think "FromTheRafters"'s head is up in the rafters in a daydream. I know you are just trolling, it's what you do, but unlike trader_4 there might be some chance of you learning something. Anyone interested might like to read this exchange while paying particular attention to the opinions of Simon Bridge and Jim Hardy. Avoid the urge to deflect by using the statement by Simon Bridge to "Treat 'voltage drop' as an informal useage with no strict definition." as it seems, considering his other contributions, that he is suggesting only to 'treat' it that way in order to avoid confusing people like trader_4 and the *everyone* trader_4 insists is silently agreeing with him. https://www.physicsforums.com/thread...e-drop.741405/ I won't be replying to you about this anymore either. I have posted many references only to have them cherry-picked for things to deflect about. Those who remain unconvinced will remain so despite anything else I can add, and trader_4 only tries to deflect to my passing mention of 'current' not actually flowing despite it being used in sentences like "The current flows down the conductor" which is by convention a normal everyday usage. My reason for even mentioning it at all is because 'voltage drop' has fallen into the same category of pervasive misuse of terminology. Maybe 'voltage drop' is just another one of those things that people with EE degrees don't need to know, but those studying physics or electronics do need to know. |
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Switchable Wall Outlet
On Wed, 28 Dec 2016 21:13:44 -0500, FromTheRafters
wrote: trader_4 used his keyboard to write : On Wednesday, December 28, 2016 at 5:47:10 PM UTC-5, Ralph Mowery wrote: In article , says... And Ohms Law still applies and works. V = IR. I=0, gives V =0, the voltage drop across the conductors is zero. Nor was there any division by zero, so don't start in with that again, please. I wouldn't dream of it, but given I=0 and nothing else, you can't nail down V nor can you nail down R by using Ohm's Law. Ohm's Law does *not* There is always some current flowing. It may only be a couple of electrons and not detectable by any common means. In the simple circuit where there is a switch and the insulation is several inches between conductors when the switch is in the off position, there is still a very , very small current flow across a very large resistance. Therefor as they say 99 and 44/100 % of the voltage is dropped across the switch when it is in the open position. All of this is picking the nits off the nits. I agree, but it's Rafter's specialty. So ther is never a 0 in the equation. Even in the ideal case, where there is zero current flow, Ohm's Law, Kirchoff's Voltage Law, still work. For some bizarre reason, Rafters claims that when we have V = IR, if I is zero, some law of mathematics involving division by zero is violated, so we can't solve for V. Everyone else here agrees we can and the answer is zero. You can't know that *everyone* agrees until *everyone* says so, and I don't mean someone using "everyone" as a nym either. What any of this has to do with wiring a switch, IDK, but here we are. You should be able to stop at any time, but you can't can you? The reason this switch thread devolved into this is because of your remark about electrical engineers not being worth their salt if they don't know about some minutia about cutting a plate on a duplex receptacle. https://dengarden.com/home-improveme...alf-hot-outlet Instead of helping the poster, you decided to attempt to make yourself look better than him (as you almost always do) by denigrating him and the place he got his degree from. IMO he learned a good deal more about the subject than you did, and put it to use in a much more complicated field. Thank you for that terse rejoinde, oner that I did not feel that I could personally post. Let me assure Trader that I know how to design an EW ESM/ ECM Systems During my job interview, we did not spend any time on Ohm's Law. I recall I was asked to explain how I might impliment Cross Pole jamming and other ECM techniques; along with ESM receiver architectures. I was hired for that Senior position. Equally irrelevant, during my qualifying interviewS, was how to do House Wiring ! My original question here, re a spilt duplex box would have been a Gotcha! I was unaware of the plug shorting shunt. Thanks to the many Positive responders - my wiring change was in place Days ago (w/o any Ohm's Law concerns)! |
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Switchable Wall Outlet
On 12/29/2016 1:07 PM, trader_4 wrote:
This just keeps going farther and farther into the wilderness. The real problem here is that Rafters does not understand Ohm's Law and Kirchhoff's Laws. He denies there is voltage drop across a capacitor that's in a circuit. Maybe were all just talking semantics here but I'm confused. With respect to DC, is a capacitor like a rechargeable battery? Is 'voltage' the same as 'voltage drop'? Is there 'voltage drop' across a battery? Is there 'voltage drop' across a rechargeable battery? Is there 'voltage drop' across a capacitor? |
#320
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Switchable Wall Outlet
On Thu, 29 Dec 2016 15:36:44 -0500, Confused
wrote: On 12/29/2016 1:07 PM, trader_4 wrote: This just keeps going farther and farther into the wilderness. The real problem here is that Rafters does not understand Ohm's Law and Kirchhoff's Laws. He denies there is voltage drop across a capacitor that's in a circuit. Maybe were all just talking semantics here but I'm confused. With respect to DC, is a capacitor like a rechargeable battery? Is 'voltage' the same as 'voltage drop'? Is there 'voltage drop' across a battery? Is there 'voltage drop' across a rechargeable battery? Is there 'voltage drop' across a capacitor? A capacitor acts "somewhat" like a battery. Voltage is a measurement of electrical pressure - or difference in electrical charge. Voltage drop is loss of "pressure" or difference in charge There is a voltage drop across a battery when under load. The amount of drop is determined by the interior resistance of the battery and explains the "droop" in voltage when a battery is placed under load. Recahgeable or not, the story is the same There is what es called the ESR of a capacitor - AKA the equivalent series resistance of the capacitor, so the not so simple answer is "yes" |
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