2. The heating principle of microwave oven.

3. Schematic diagram of microwave oven heating.

The heating principle of microwave oven is to directly convert electric energy into internal energy.

1. "The principle of microwave heating provides you with graphic information of the principle of microwave heating. Microwave ovens heat food through microwaves emitted by magnetrons. The magnetron in the microwave oven can generate microwaves with a vibration frequency of 2.5 billion times per second. This kind of microwave can penetrate 5 cm inside the food and make the water molecules in the food move accordingly. Water molecules generate a lot of heat energy during the movement, so food is heated.