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How do microwave ovens work?

In a microwave oven, food is cooked by exposing it to microwave radiation. Most household microwave ovens operate on a frequency of 2450 megahertz (MHz or million cycles per second) in a continuous wave (cw) mode. Larger ovens used for industrial applications sometimes operate at 915 MHz.

The source of the radiation in a microwave oven is the magnetron tube. The magnetron, basically, converts 60 Hz powerline electric current to electromagnetic radiation of 2450 MHz. The high voltage (typically 3,000 to 4,000 volts) which powers the magnetron tube is produced by a step-up transformer rectifier, and filter which converts the 120V AC (alternating current or 60 Hz line voltage) to 4 kV DC (direct current).

The microwave energy from the magnetron is transferred to the oven cavity through a waveguide section. A mode stirrer spreads the microwave energy more or less evenly throughout the oven.

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