The magnetron is a vacuum-tube oscillator whose frequency is set by machined metal, not a tuned circuit, and almost everything people believe about why it cooks is wrong. Why 2.45GHz has nothing to do with water resonance, why food cooks from the outside in, the standing-wave cold spots the turntable exists to fix, why pointed metal arcs and flat metal does not, and inverter vs transformer power.
Microwave
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How a Microwave Oven Actually Works