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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.
Diode burn. The high voltage diodes could be shorted or burned causing sparking inside microwave. So next time if you see spark inside your microwave, do not get scared. Immediately switch off the microwave and perform the necessary inspection before calling a technician. reasons behind a noisy refrigerator. Sparking inside microwave is common and does not indicate that your microwave has gone bad. When a microwave sparks most people panic. But this situation is not to panic. It requires you to immediately switch off your microwave and perform the necessary inspection.