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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.
Use the keypad on your microwave to press the numbers that coincide with the amount of time you wish to cook your food for. Locate the âPowerâ button on your microwave. This button is located on most microwaves among the other functions of the microwave, such as âdefrost,â âcook,â âstopâ and âstartâ buttons. Press the âPowerâ button. Once you press the power button, a number will show up on the microwave display.