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  • NiytOwl commented on KJMagnetics's instructable DIY Induction Stove8 months ago
    DIY Induction Stove

    By using spinning magnets, the OP is essentially creating a generator with the pan being the conductor in the magnetic field. So any conductive material will work, although better conductors with thicker cross sections will generate more heat. That's why the thicker aluminum pan got hotter. A thicker pan has more material exposed to the magnetic field, which will induce more current in the pan. Also, the faster the magnetic field fluctuates (more magnets or faster rotation), the more current, and therefore resistive heating. If this setup where to use a few pulleys to increase the rotational speed, the pan would get much hotter - limited only by the power of the motor. Not exactly practical, but definitely a good illustration of the principle.The commercial induction stoves requir...

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    By using spinning magnets, the OP is essentially creating a generator with the pan being the conductor in the magnetic field. So any conductive material will work, although better conductors with thicker cross sections will generate more heat. That's why the thicker aluminum pan got hotter. A thicker pan has more material exposed to the magnetic field, which will induce more current in the pan. Also, the faster the magnetic field fluctuates (more magnets or faster rotation), the more current, and therefore resistive heating. If this setup where to use a few pulleys to increase the rotational speed, the pan would get much hotter - limited only by the power of the motor. Not exactly practical, but definitely a good illustration of the principle.The commercial induction stoves require steel (ferrous material) because they are essentially set up as transformers with the steel in the pan forming the core. With no secondary winding, all the power goes into creating eddy currents in the core (the pan) producing resistive heat.

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  • NiytOwl commented on deba168's instructable Make 4 Useful Things From 9V Dead Battery2 years ago
    Make 4 Useful Things From 9V Dead Battery

    While I applaud the author for making something from trash, this is NOT economical! I don't think a light or a fan makes sense when the purchased alternative costs about the same and lasts significantly longer. Around here 9v batteries go for about $2 a pop. For the same $2 I can buy a little AA flashlight that lasts 3x as long on a 50-cent battery. The same goes for the fan. I picked one up a few years ago from the dollar store. It uses two AA batteries for a grand total of $2 and I'll bet it runs 5x longer than the 9v equivalent. As far as the parts go, I have 9v battery clips I bought off eBay at 99 cents for 10. If you made minimum wage disassembling batteries you would lose money trying to disassemble 90 batteries an hour.That said, when I needed ONE clip I did take apart a...

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    While I applaud the author for making something from trash, this is NOT economical! I don't think a light or a fan makes sense when the purchased alternative costs about the same and lasts significantly longer. Around here 9v batteries go for about $2 a pop. For the same $2 I can buy a little AA flashlight that lasts 3x as long on a 50-cent battery. The same goes for the fan. I picked one up a few years ago from the dollar store. It uses two AA batteries for a grand total of $2 and I'll bet it runs 5x longer than the 9v equivalent. As far as the parts go, I have 9v battery clips I bought off eBay at 99 cents for 10. If you made minimum wage disassembling batteries you would lose money trying to disassemble 90 batteries an hour.That said, when I needed ONE clip I did take apart a 9v (to make the LED flashlight 12 years ago when such things were still a novelty item). It made sense considering the time it would take to order them and the wait 2 weeks to get them.

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