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#1
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What exactly does the resister do in electronics and such.
For example:
+-------------RESISTER----|-------| LED LED | | -_____________________________ Leds wired parallel. I believe this diagram is right. What is the need of the resister if: Source Volts: 5 Draw per LED: 3.7V What exactly is it doing. Sorry if Im sounding/looking amature I want to learn though. Buck |
#2
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What exactly does the resister do in electronics and such.
"Buckshot" wrote in message
For example: +-------------RESISTER----|-------| LED LED | | -_____________________________ Leds wired parallel. I believe this diagram is right. What is the need of the resister if: Source Volts: 5 Draw per LED: 3.7V What exactly is it doing. Sorry if Im sounding/looking amature I want to learn though. Buck RESISTOR AMATEUR Without the resistor the LEDs would have 5V across them and they would burn out in a fraction of a second. -- Brian Gregory (In the UK). To email me remove the letter vee. |
#3
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What exactly does the resister do in electronics and such.
"Brian Gregory [UK]" wrote in message ... "Buckshot" wrote in message For example: +-------------RESISTER----|-------| LED LED | | -_____________________________ Leds wired parallel. I believe this diagram is right. What is the need of the resister if: Source Volts: 5 Draw per LED: 3.7V What exactly is it doing. Sorry if Im sounding/looking amature I want to learn though. Buck RESISTOR AMATEUR Without the resistor the LEDs would have 5V across them and they would burn out in a fraction of a second. Voltage is not load. Voltage is "electrical pressure." (in water, p.s.i.) Amperage is "electrical flow." (in water, gal. per min.) Resistance is the amount the "flow" is restricted by load. |
#4
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What exactly does the resister do in electronics and such.
Physically the resistor is placed between the current source, be it a
battery, etc and the load, in your case the leds. The purpose is to limit the current flow through the whole circuit, but more specifically the applied current to the load, your leds. In doing this heat is dissipated at the resistor and a voltage drop is developed across the resistor. Therefore the applied voltage and currents applied to the load, your leds, will not exceed the manufacturer specifications. As stated, without limiting the current and voltage to the leds they will surely fail in a short period of operation. Formulae I=E/R Current equals voltage divided by resistance, for a purely resistive load. Hope this helps kiddo, keep on asking questions, inquisitive minds are never bored!! Cheers "Reason" wrote in message news:TdnFc.41411$l6.19925@clgrps12... "Brian Gregory [UK]" wrote in message ... "Buckshot" wrote in message For example: +-------------RESISTER----|-------| LED LED | | -_____________________________ Leds wired parallel. I believe this diagram is right. What is the need of the resister if: Source Volts: 5 Draw per LED: 3.7V What exactly is it doing. Sorry if Im sounding/looking amature I want to learn though. Buck RESISTOR AMATEUR Without the resistor the LEDs would have 5V across them and they would burn out in a fraction of a second. Voltage is not load. Voltage is "electrical pressure." (in water, p.s.i.) Amperage is "electrical flow." (in water, gal. per min.) Resistance is the amount the "flow" is restricted by load. |
#5
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What exactly does the resister do in electronics and such.
Thank you guys, I understand now, and Brian you don't have to be a dick
jesus. Thats why I was asking, I'm NEW. Buck "JeffM" wrote in message om... +-------------RESISTER----|-------| LED LED | | -_____________________________ ASCII art is done in a monospaced font (Courier). Set your newsreader accordingly or use Notepad. Leds...What is the need of the resister if: Source Volts: 5 Draw per LED: 3.7V Buckshot Items do not "draw" voltage; they draw current. Subjects to investigate: 1) Ohm's Law 2) Voltage drop This is covered on Day 1 of Electricity 101. :RESISTOR :AMATEUR : Brian Gregory : LEDs Note: LEDs in parallel may not be the same brightness (manufacturing tolerances/lots). If 1 LED fails shorted (typical for a semiconductor), both will go dark. Translation: If looking for redundancy, not the optimal circuit. |
#6
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It limits the current through the LEDs. The value of the resistor should be
calculated so that in the case you specify (though it looks different to the diagram, I must say) the (5-3.7)V across it should only allow about 20mA through it, otherwise the leds will burn out pronto "Buckshot" ha scritto nel messaggio ... For example: +-------------RESISTER----|-------| LED LED | | -_____________________________ Leds wired parallel. I believe this diagram is right. What is the need of the resister if: Source Volts: 5 Draw per LED: 3.7V What exactly is it doing. Sorry if Im sounding/looking amature I want to learn though. Buck |
#7
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If the LEDS are parallel, then the Voltage drop should be 1.7V, NOT 3.7V!
"Reason" ha scritto nel messaggio news:TdnFc.41411$l6.19925@clgrps12... "Brian Gregory [UK]" wrote in message ... "Buckshot" wrote in message For example: +-------------RESISTER----|-------| LED LED | | -_____________________________ Leds wired parallel. I believe this diagram is right. What is the need of the resister if: Source Volts: 5 Draw per LED: 3.7V What exactly is it doing. Sorry if Im sounding/looking amature I want to learn though. Buck RESISTOR AMATEUR Without the resistor the LEDs would have 5V across them and they would burn out in a fraction of a second. Voltage is not load. Voltage is "electrical pressure." (in water, p.s.i.) Amperage is "electrical flow." (in water, gal. per min.) Resistance is the amount the "flow" is restricted by load. |
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