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How Microwaves Cook Food. When you hit the start button it usually takes about 2 seconds to heat up a filament inside the magnetron tube, says Schiffmann. The microwaves are then blasted into the food compartment. The commonly used frequency of microwaves, 2.45 gigahertz, is easily absorbed by water, fat, and sugar.
The microwave works properly on the timed cooking when the door is closed. When the door is opened, the fan continues to run, and the turntable continues to turn. Interestingly, when you open the door repeatedly, the turntable changes directions almost every time.