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It’s quicker
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Wait how does the microwave go faster when it's also on half the supply voltage?
Because resistive heating is inefficient. You need to pump a lot of power through to get a lot of heat. A microwave does not use resistive heating and works on a completely different principle and therefore the amount of power available is much less importance.
Resistive heating inefficient? What is the energy wasted as, if not heat?
don't the coils glow slightly? I guess light would be mostly wasted energy, no?