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#1
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How long does it take a microwave oven to warm up?
I often cook things that take maybe 7 or 8 seconds. Maybe if they're really small they take 5 but it's hard to know in advance and I really dislike most overcooked things. Undercooked, one can just cook it some more but is two 5-second zappings the same as one 10-second zap? Or does it take a second (or 2 or 3 or more) to get the waves churning, so two 5-seconds is more like 9 seconds (or 8 or 6)? I need to know so that eventually I'll know the proper time for a particular food, without stopping and checking**. Has anyone read about this? Or other oscillators? **This actually raises another question. I'm pretty darn good at predicting how much time I need to microwave something, and once in a while I can even remember from experience. (Cocoa from refrigerated milk is 2 minutes. An eggroll of a given size is 2 minutes 40 seconds, even though wrapper says 4 minutes.) But what if part of something much bigger than 10-second food is cooked enough and I take it to the table and start eating and when I get to another part, find that it is not cooked enough. By this time all of it has cooled some. In that case, it's not the microwave warm-up time that would matter, but am I right that there is still food warm-up time? If the food is 70^, it might not even start cooking until the part that cooks reaches, what, let's assume 110. (Or maybe someone has a real number for a given food) So if one is eating for 15 minutes, the 120 degree food will have cooled off to 80 degrees, and if I put it back in, it still has to get back up to 110 again, before it even starts cooking again, is that right? That could take 20 or 30 seconds or more, depending on how much food there is and other details. I dont' mind the extra time, but I would like it if someone could provide real-life numbers so I could better estimate how long the 2nd part of the cooking will take. |
#2
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On Wednesday, November 30, 2016 at 4:23:51 PM UTC-6, micky wrote:
How long does it take a microwave oven to warm up? Unless I've missed something, microwave ovens don't heat up. |
#3
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micky explained on 11/30/2016 :
How long does it take a microwave oven to warm up? The energy transfer is nearly immediate. The oven only warms up because of the food warming up. Some items which I microwave would end up having cold or cool spots, so I used to cook say a three minute item by cooking for two minutes and then allowing the heat to spread for a couple of minutes, and then zap for another minute or so. I now have a new microwave oven with a turntable (the other had a reflector) to help avoid the spottiness. The ovens power output is also an important factor to consider. |
#4
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On Wed, 30 Nov 2016 14:36:51 -0800 (PST), ItsJoanNotJoann
wrote: On Wednesday, November 30, 2016 at 4:23:51 PM UTC-6, micky wrote: How long does it take a microwave oven to warm up? Unless I've missed something, microwave ovens don't heat up. The m-oven dont heat up! The food heats from the inside and m-waves cause the water molecules to heat. Food has to have moisture in it in order to heat up. If you put something in there that has no moisture, it wont get warm or hot. Thats why a plastic bowl wont heat up, only the food inside of it gets warm. |
#5
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micky wrote:
How long does it take a microwave oven to warm up? The heater in the magnetron tube takes a couple seconds to warm to the point where it will emit electrons. You can hear it easily on the old transformer microwaves, the fan starts and it begins to hum, then a couple seconds later the hum gets much louder. That louder hum is when the magnetron tube starts conducting. Newer microwaves with switching power supplies may delay turning on the HV until the heater has warmed up, and they may not have that transformer hum, so it may be harder to tell when the RF comes on. Jon |
#6
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#7
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On 11/30/2016 5:45 PM, FromTheRafters wrote:
micky explained on 11/30/2016 : How long does it take a microwave oven to warm up? The energy transfer is nearly immediate. The oven only warms up because of the food warming up. Some items which I microwave would end up having cold or cool spots, so I used to cook say a three minute item by cooking for two minutes and then allowing the heat to spread for a couple of minutes, and then zap for another minute or so. I now have a new microwave oven with a turntable (the other had a reflector) to help avoid the spottiness. The ovens power output is also an important factor to consider. I find it easier to microwave for longer periods of time at a lower setting to get even heat. |
#8
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On 11/30/2016 6:26 PM, notbob wrote:
On 2016-11-30, wrote: The food heats from the inside..... Have you ever used a microwave oven? I still hear this myth being pushed. Food does NOT heat from the inside, it heats from the outside in. DUH!! nb Yes, about 1/4" penetration. Fat molecules heat fastest followed by sugar. Dry stuff is hardest to heat. Once you understand how it works you get better results. Standing time is important too. The molecules are still active a while after the mw is off and it allows the heat to penetrate more and hot spots to dissipate. The myth of heating from the inside is easy to understand. Just like the pies at McDonalds warns of the inside being hot, the sugary inside will heat faster than the dry outside though they both received the mw energy at the same time. |
#9
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Frank formulated the question :
On 11/30/2016 5:45 PM, FromTheRafters wrote: micky explained on 11/30/2016 : How long does it take a microwave oven to warm up? The energy transfer is nearly immediate. The oven only warms up because of the food warming up. Some items which I microwave would end up having cold or cool spots, so I used to cook say a three minute item by cooking for two minutes and then allowing the heat to spread for a couple of minutes, and then zap for another minute or so. I now have a new microwave oven with a turntable (the other had a reflector) to help avoid the spottiness. The ovens power output is also an important factor to consider. I find it easier to microwave for longer periods of time at a lower setting to get even heat. Yes, the new MW oven has programmable settings for power level and rest periods and such for better results. The old one only had a single knob with minute marks on it and a bell that softly, almost inaudibly, went 'click' when the time expired. The old one is 26 years old, but it still works. |
#10
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On Wednesday, November 30, 2016 at 5:41:20 PM UTC-6, Frank wrote:
I find it easier to microwave for longer periods of time at a lower setting to get even heat. Me, too and my microwave oven is a 1200 watt model. I've found out if I heat a mug of soup for 3½ minutes at 60% power vs. 2 minutes at 100% power I get no boil overs and even heating. It took a while for me to hit on this power and time limit when upgrading from an 800 watt model. I sure did get tired of cleaning up messes. :-) |
#11
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Stick a compact fluorescent light bulb in the Uwave. It wil normally glow as soon as the microwaves actually come into the oven from the magnetron. It should be less than 2 seconds from the time you push the start button.
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#12
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On 2016-12-01, Ed Pawlowski wrote:
The myth of heating from the inside......... .....is jes that. A myth. Nuke a potato. No dry. No layers. No myths. The outside cooks sooner than the inside. All the rest is ignorance or lack of experience. ![]() nb |
#13
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On Wed, 30 Nov 2016 17:16:05 -0600, Jon Elson wrote:
The heater in the magnetron tube takes a couple seconds to warm to the point where it will emit electrons. You can hear it easily on the old transformer microwaves, the fan starts and it begins to hum, then a couple seconds later the hum gets much louder. That louder hum is when the magnetron tube starts conducting. Newer microwaves with switching power supplies may delay turning on the HV until the heater has warmed up, and they may not have that transformer hum, so it may be harder to tell when the RF comes on. +1, You are the only one who did not lambast the OP for using the term 'warm up' to mean 'cause the ambient MW intensity to reach its operational range'. When I am judging time for extremely small loads (like softening butter without liquifying it), I allow 4 seconds for my oven. I find that the hum does not get louder though. Instead, I notice that the fan speed lowers a bit, presumably because the supply voltage for the fan is then being loaded down by the power consumption by the magnetron. |
#14
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In sci.electronics.repair, on Wed, 30 Nov 2016 19:33:00 -0500,
FromTheRafters wrote: Frank formulated the question : On 11/30/2016 5:45 PM, FromTheRafters wrote: micky explained on 11/30/2016 : How long does it take a microwave oven to warm up? The energy transfer is nearly immediate. The oven only warms up because of the food warming up. Some items which I microwave would end up having cold or cool spots, so I used to cook say a three minute item by cooking for two minutes and then allowing the heat to spread for a couple of minutes, and then zap for another minute or so. I now have a new microwave oven with a turntable (the other had a reflector) to help avoid the spottiness. The ovens power output is also an important factor to consider. I find it easier to microwave for longer periods of time at a lower setting to get even heat. Yes, the new MW oven has programmable settings for power level and rest periods and such for better results. The old one only had a single knob with minute marks on it and a bell that softly, almost inaudibly, went 'click' when the time expired. The old one is 26 years old, but it still works. I had an Amana Model 2, that looked just like the drawings of microwaves that were used for decades. It lasted many years. I got it used around 1975 and met its earthly demise around 2000. . Although the insulation on the diodes had failed** and it sparked, so I covered the open parts with GE silicon sealant, and something else I fixed, and eventually the power transformer broke, I think it was. They wanted 300 dollars for it and my pointing out that they should take 80 since I coudl buy a new one for 80 didn't help. They lowered the price to the repairmans price of 200 roughly. **Amanda didn't want to send me a schematic. I had to beg, and promise I knew what I was doing and wouldn't kill myself. She relented. |
#15
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micky wrote:
How long does it take a microwave oven to warm up? My Panasonic inverter seems to take up to 3 seconds to get going. That device has a variable supply, which it can control heat output. Most others are instant on. Food still is cooking when power is off. As it cools it's also heating cooler areas. Usuall recommended to wait one minute before eating. Enclosed containers also equalize heating by steam. The microwave is a bit over 2 inches in length, so not all parts receive equal heating. There is usually the rotating plate, but some have rotating devices in waveguide to spread out the waves to also help equalize. Greg |
#16
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On Thu, 1 Dec 2016 09:30:43 -0000 (UTC), gregz
wrote: micky wrote: How long does it take a microwave oven to warm up? My Panasonic inverter seems to take up to 3 seconds to get going. Greg +1 I was going to say the same thing. It depends on the microwave but my Panasonic is just like yours. So, 5 seconds is really 2 seconds and 10 seconds is really 7 seconds. To the OP, two 5's is definitely not the same as one 10. As others said, you should be able to figure out the start-uip time for your particular oven. |
#17
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Micky,
Heating improves the physical "eatability" of products and also beats the crap out of bacteria. If you cook for under the prescribed time to suit your tastes then you need to understand about the bacteria.. Don't poison yourself. Sorry, can't help you with cooking times. Dave M. |
#18
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When I tested it long ago, it took 2 seconds for the radiation to start hitting.
So a 2 second heating did nothing, a 3 second heating was actually 1 second, but a 60 second heating was 58 seconds which is close enough. My wife has a strategy. If it needs 10 seconds, she hits 11, which lets her hit the same button twice instead of moving over to the zero and maybe missing. Same for 22, 33, 44 seconds. They're all close enough. The way I tested it was to put a piece of wire in and watch for it to spark. I used a twist tie, bent in a rabbit ear antenna shape, at approximately the half wavelength. don't try this at home. |
#19
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ItsJoanNotJoann wrote: "
Me, too and my microwave oven is a 1200 watt model. I've found out if I heat a mug of soup for 3½ minutes at 60% power vs. 2 minutes at 100% power I get no boil overs and even heating. It took a while for me to hit " You've learned something few realize about microwave ovens: 100%, or Full power, is good for only one thing: boiling water. 50-60% on a microwave corresponds to medium on a typical electric stove, and is where most cooking should go on. It will require longer cooking times, but will cook more evenly and without scorching. As for someone else on here suggesting microwaves do not cook from the inside out: A year ago I had occasion to warm up a frozen stick of butter. So I programmed 4 minutes on level 3(medium low). What came out was a mostly intact stick with HOLES IN THE SIDES where hot butter had poured out from INSIDE. |
#20
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#21
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On Thu, 1 Dec 2016 06:27:09 -0800, "Colonel Edmund J. Burke"
wrote: On 11/30/2016 2:23 PM, micky wrote: How long does it take? Micky, I really don't think about stuff like that, being concerned with more pressing philosophical matters. Apart from the fact that Sun**** ****eau don't got electrickity! |
#22
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On Wednesday, November 30, 2016 at 5:36:55 PM UTC-5, ItsJoanNotJoann wrote:
On Wednesday, November 30, 2016 at 4:23:51 PM UTC-6, micky wrote: How long does it take a microwave oven to warm up? Unless I've missed something, microwave ovens don't heat up. +1 On my late mode Panasonic though, it seems there is maybe a 1 sec delay before the light inside dims slightly, indicating that it's doing something. But regardless, the question makes no sense to me. We all learn from experience, it doesn't take long using it to figure out how long it takes to heat various things. And how long it takes will also depend on the item. If you're trying to heat something with moisture in it, it heats quickly. If you're trying to heat something that is very dry, it heats up very slowly. Fortunately most food things have plenty of water in them. |
#23
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On 11/30/2016 4:23 PM, micky wrote:
An eggroll of a given size is 2 minutes 40 seconds, even though wrapper says 4 minutes.) Pan fry your egg rolls, roll so four sides get crispy. Microwaved egg rolls just aren't worth eating. IMHO Mikek |
#24
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On Wednesday, November 30, 2016 at 6:12:39 PM UTC-5, Jon Elson wrote:
micky wrote: How long does it take a microwave oven to warm up? The heater in the magnetron tube takes a couple seconds to warm to the point where it will emit electrons. You can hear it easily on the old transformer microwaves, the fan starts and it begins to hum, then a couple seconds later the hum gets much louder. That louder hum is when the magnetron tube starts conducting. Newer microwaves with switching power supplies may delay turning on the HV until the heater has warmed up, and they may not have that transformer hum, so it may be harder to tell when the RF comes on. Jon +1 exactly correct m |
#25
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On 12/1/2016 6:50 AM, NEMO wrote:
On Thu, 1 Dec 2016 06:27:09 -0800, "Colonel Edmund J. Burke" wrote: On 11/30/2016 2:23 PM, micky wrote: How long does it take? Micky, I really don't think about stuff like that, being concerned with more pressing philosophical matters. Apart from the fact that Sun**** ****eau don't got electrickity! OHMYGAWD! Try to come up with something, ANTHING, entertaining, you ignorant fool! |
#26
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On 11/30/2016 04:23 PM, micky wrote:
[snip] **This actually raises another question. I'm pretty darn good at predicting how much time I need to microwave something, and once in a while I can even remember from experience. (Cocoa from refrigerated milk is 2 minutes. An eggroll of a given size is 2 minutes 40 seconds, even though wrapper says 4 minutes.) I have an older microwave, that has only 700W. Most directions are for higher power. I find most things are OK if I add 25% to the cooking time. For example, if it says 3 minutes I use 3:45. BTW, some people have said that if I got a new microwave, it would probably fail before the old one. [snip] -- 24 days until the winter celebration (Sunday December 25, 2016 12:00:00 AM for 1 day). Mark Lloyd http://notstupid.us/ "If fascism ever comes to America, it will be wrapped in the flag and carrying a cross." -- Upton Sinclair, Huey P. Long, and others. |
#27
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On 11/30/2016 04:36 PM, ItsJoanNotJoann wrote:
On Wednesday, November 30, 2016 at 4:23:51 PM UTC-6, micky wrote: How long does it take a microwave oven to warm up? Unless I've missed something, microwave ovens don't heat up. The air in the microwave doesn't heat up much. The food does (IIRC microwaves affect water molecules). So the food is cooked by heat the same in a conventional oven. It's just the immediate source of the heat is different (the water in the food rather than the air around it). -- 24 days until the winter celebration (Sunday December 25, 2016 12:00:00 AM for 1 day). Mark Lloyd http://notstupid.us/ "If fascism ever comes to America, it will be wrapped in the flag and carrying a cross." -- Upton Sinclair, Huey P. Long, and others. |
#28
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On 11/30/2016 05:26 PM, notbob wrote:
On 2016-11-30, wrote: The food heats from the inside..... Have you ever used a microwave oven? I still hear this myth being pushed. Food does NOT heat from the inside, it heats from the outside in. DUH!! nb Since the hear comes from the water molecules in the food, heat comes from all over. However, the microwaves come from outside and there would be some attenuation in the interior of the food, so essentially it heats from outside. -- 24 days until the winter celebration (Sunday December 25, 2016 12:00:00 AM for 1 day). Mark Lloyd http://notstupid.us/ "If fascism ever comes to America, it will be wrapped in the flag and carrying a cross." -- Upton Sinclair, Huey P. Long, and others. |
#29
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On 11/30/2016 06:33 PM, FromTheRafters wrote:
[snip] The old one is 26 years old, but it still works. I have a 30 year old JCPenney microwave (from the time they sold a lot of things rather than just clothes and related stuff). -- 24 days until the winter celebration (Sunday December 25, 2016 12:00:00 AM for 1 day). Mark Lloyd http://notstupid.us/ "If fascism ever comes to America, it will be wrapped in the flag and carrying a cross." -- Upton Sinclair, Huey P. Long, and others. |
#30
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On 12/01/2016 07:44 AM, TimR wrote:
When I tested it long ago, it took 2 seconds for the radiation to start hitting. So a 2 second heating did nothing, a 3 second heating was actually 1 second, but a 60 second heating was 58 seconds which is close enough. My wife has a strategy. If it needs 10 seconds, she hits 11, which lets her hit the same button twice instead of moving over to the zero and maybe missing. Same for 22, 33, 44 seconds. They're all close enough. I discovered mine could be set for 90 seconds (normally an invalid entry, but it works), which saves a little work over the "130" (1 min 30 sec) you're supposed to use. The way I tested it was to put a piece of wire in and watch for it to spark. I used a twist tie, bent in a rabbit ear antenna shape, at approximately the half wavelength. don't try this at home. Once I microwaved one of he free AOL CDs. -- 24 days until the winter celebration (Sunday December 25, 2016 12:00:00 AM for 1 day). Mark Lloyd http://notstupid.us/ "If fascism ever comes to America, it will be wrapped in the flag and carrying a cross." -- Upton Sinclair, Huey P. Long, and others. |
#31
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On 12/01/2016 09:15 AM, amdx wrote:
On 11/30/2016 4:23 PM, micky wrote: An eggroll of a given size is 2 minutes 40 seconds, even though wrapper says 4 minutes.) Pan fry your egg rolls, roll so four sides get crispy. Microwaved egg rolls just aren't worth eating. IMHO Mikek Mostly I use the microwave for heating already-cooked food. One exception is bacon. -- 24 days until the winter celebration (Sunday December 25, 2016 12:00:00 AM for 1 day). Mark Lloyd http://notstupid.us/ "If fascism ever comes to America, it will be wrapped in the flag and carrying a cross." -- Upton Sinclair, Huey P. Long, and others. |
#32
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On 12/1/2016 11:35 AM, Mark Lloyd wrote:
On 11/30/2016 04:23 PM, micky wrote: [snip] **This actually raises another question. I'm pretty darn good at predicting how much time I need to microwave something, and once in a while I can even remember from experience. (Cocoa from refrigerated milk is 2 minutes. An eggroll of a given size is 2 minutes 40 seconds, even though wrapper says 4 minutes.) I have an older microwave, that has only 700W. Most directions are for higher power. I find most things are OK if I add 25% to the cooking time. For example, if it says 3 minutes I use 3:45. BTW, some people have said that if I got a new microwave, it would probably fail before the old one. Maybe, we have one that was manufactured in 1983, still works fine, but we have two, and this one is not used as much. Mikek |
#33
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#34
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In sci.electronics.repair, on Wed, 30 Nov 2016 23:20:17 -0500, Mike
Duffy wrote: On Wed, 30 Nov 2016 17:16:05 -0600, Jon Elson wrote: The heater in the magnetron tube takes a couple seconds to warm to the point where it will emit electrons. You can hear it easily on the old transformer microwaves, the fan starts and it begins to hum, then a couple seconds later the hum gets much louder. That louder hum is when the magnetron tube starts conducting. Newer microwaves with switching power supplies may delay turning on the HV until the heater has warmed up, and they may not have that transformer hum, so it may be harder to tell when the RF comes on. +1, You are the only one who did not lambast the OP for using the term 'warm up' to mean 'cause the ambient MW intensity to reach its operational range'. Just for the record, I consciously used the phrase, because it reminds me of simpler times, harmed only by the extra time it took to turn on the radio or tv. (In the movies, sometimes they would turn something on and it woudl start immediately. I did stay at a hotel once 8 years ago that was also operating in the 30's and it still had the remote speaker/channel selector for the central radio it used then. Each room had one and the patron could swtich between two or three stations, and adjust the volume, so when you turned it on, it went on immediately. Unfortunately, the hotel finally closed.) When I am judging time for extremely small loads (like softening butter without liquifying it), I allow 4 seconds for my oven. I'm pretty sure mine is less tnan 4 seconds becuase I really have used 7 seconds and found noticeable heating, more than I think 3 seconds would have done, based on the prior 10 seconds. BTW, if you get one of those slabs of chocolate chip cookies, precut, they say to cook them in a hot oven of course, but 37 seconds per square does a good job. Not like baked, but like a differen4 recipe. Another reason to know the startup time is if I make two of them, it only has to start-up once, so it needs less than twice the time, but the instructions already say less than twice the time, and their differential is greater than 4 seconds. I think there is some reason for that other than start-up, warm-up time. I find that the hum does not get louder though. Instead, I notice that the fan speed lowers a bit, presumably because the supply voltage for the fan is then being loaded down by the power consumption by the magnetron. |
#35
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Mark Lloyd wrote:
On 11/30/2016 04:36 PM, ItsJoanNotJoann wrote: On Wednesday, November 30, 2016 at 4:23:51 PM UTC-6, micky wrote: How long does it take a microwave oven to warm up? Unless I've missed something, microwave ovens don't heat up. The air in the microwave doesn't heat up much. The food does (IIRC microwaves affect water molecules). So the food is cooked by heat the same in a conventional oven. It's just the immediate source of the heat is different (the water in the food rather than the air around it). My microwave air can heat up to 450 degrees. Well, it's a combo microwave/turbo oven. You can set it so It will alternate between the two modes. Greg |
#36
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On Thursday, December 1, 2016 at 6:31:05 PM UTC-5, Ed Pawlowski wrote:
On 12/1/2016 8:59 AM, wrote: As for someone else on here suggesting microwaves do not cook from the inside out: A year ago I had occasion to warm up a frozen stick of butter. So I programmed 4 minutes on level 3(medium low). What came out was a mostly intact stick with HOLES IN THE SIDES where hot butter had poured out from INSIDE. Shows how microwaves cook unevenly and a few spots got the energy and penetrated. In the early days of microwave ovens (some of us are old enough to remember when they first started to become common) we tested the unevenness with mini marshmallows. You were supposed to put a close grid of minimarshmallows covering the bottom and watch them cook. You'll see a pattern of hot and cold spots. That advice came from cooking shows I think. The early microwaves did not have a turntable. The second generation had a rotating "fan" that bounced the waves around, and the third generation had the now ubiquitous turntable, that helps a lot with evenness of heat. |
#37
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FromTheRafters posted for all of us...
The ovens power output is also an important factor to consider. Get a Binford 6150 MMMMM More power. -- Tekkie |
#38
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In sci.electronics.repair, on Thu, 1 Dec 2016 09:15:49 -0600, amdx
wrote: On 11/30/2016 4:23 PM, micky wrote: An eggroll of a given size is 2 minutes 40 seconds, even though wrapper says 4 minutes.) Pan fry your egg rolls, roll so four sides get crispy. I may take your suggestion if I can find the pan. If I can find the oil. Microwaved egg rolls just aren't worth eating. IMHO Mikek It's a different taste sensation. Next I should try them with chocolate syrup! |
#39
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On Friday, December 2, 2016 at 7:24:36 AM UTC-6, TimR wrote:
On Thursday, December 1, 2016 at 6:31:05 PM UTC-5, Ed Pawlowski wrote: On 12/1/2016 8:59 AM, wrote: As for someone else on here suggesting microwaves do not cook from the inside out: A year ago I had occasion to warm up a frozen stick of butter. So I programmed 4 minutes on level 3(medium low). What came out was a mostly intact stick with HOLES IN THE SIDES where hot butter had poured out from INSIDE. Shows how microwaves cook unevenly and a few spots got the energy and penetrated. In the early days of microwave ovens (some of us are old enough to remember when they first started to become common) we tested the unevenness with mini marshmallows. You were supposed to put a close grid of minimarshmallows covering the bottom and watch them cook. You'll see a pattern of hot and cold spots. That advice came from cooking shows I think. The early microwaves did not have a turntable. The second generation had a rotating "fan" that bounced the waves around, and the third generation had the now ubiquitous turntable, that helps a lot with evenness of heat. Back in 1990, I bought a plastic windup turntable for a girlfriend's microwave. It helped a lot to get things to cook evenly along with the microwave's RF stirring fan. I never took it apart to see if it actually had a plastic spring but microwaves didn't heat it up. I just searched and found that the little turntables are still available. ヽ(ヅ)ノ http://www.ebay.com/itm/like/332041273640 [8~{} Uncle Micro Monster |
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Posted to sci.electronics.repair,alt.home.repair
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In sci.electronics.repair, on Fri, 2 Dec 2016 16:22:34 -0500, Tekkie®
wrote: FromTheRafters posted for all of us... The ovens power output is also an important factor to consider. Get a Binford 6150 MMMMM More power. All my power tools are Binford. |
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