This you tube video shows a method to make a device which can help you to generate voltage with temperature. This may be not useful when you at home but indeed this will be helpful if you are not in a place where the electricity not available. And its worth to watch for your knowledge
This guy in this video uses a special gadget to do this trick, and as he says its not a expensive thing to buy. Think you on camping and your phone's battery got drained and the power bank also not working, here you have the solution for that you can charge your phone while cooking some eggs.
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