How does the induction cooker work?why aluminium pot does not work ?

It's an eletro-magnet. The field changes very quickly (20-30 KHz) each cycle magnetizes and demagnetizes the pan, each cycle loses some energy - which goes into heating the food. It is possible to heat aluminium with an inductor but it is less effective and needs a different frequency - I waked on a system that would heat coffee/ready meals with an Aluminium film inside the packaging and an inductor pad on the counter.
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