Working of Microwave Oven

In microwave oven, magnetron is present inside a strong metal box. So, when the food is placed inside the chamber and timer is switched on, a signal is sent to magnetron to emit microwaves and simultaneously the turn table also starts turning.

The following figure lists the steps occurring after the cooking start:

1. The electricity is provided to the magnetron from the power outlet. It converts the electricity into high - powered, 12cm (4,7 inch) radio waves. 
2. Three waves are blasted by the magnetron through a channel into the food compartment. This channel is called a wave guide. 
3. The food which is present on the turntable, spins a slowl round so it can be cooked evenly by the microwaves. 
4. The water molecules are contacted by the micro waves. Then the water molecules start vibrating against each other at a very high speed generating heat. 

It is known that vibrating molecules emit heat. So, faster the molecules vibrate the quicker the food will get heated up. Therefore, we can say that the molecules present in the food cause rapid heat as Microsoft waves pass on their energy to them.