Definition and function of microwave oven are
Definition Of Microwave Oven.
A microwave oven is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range.
Discovery Of Microwave Oven:
In 1945, the heating effect of a high-power microwave beam was accidentally discovered by Percy Spencer, an American self-taught engineer from Howland, Maine.
Spencer created a high density electromagnetic field by feeding microwave power from a magnetron into a metal box from which it had no way to escape. When food was placed in the box with the microwave energy, the temperature of the food rose rapidly. On 8 October 1945, Raytheon filed a United States patent application for Spencer’s microwave cooking process, and an oven that heated food using microwave energy from a magnetron was soon placed in a Boston restaurant for testing.
Working Principle 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.
1.The electricity is provided to the magnetron from the power outlet. It converts the electricity into high‐powered.
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 turn table, spins a slow 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 micro waves pass on their energy to them.