How electric rice cooker works

Ans:
The bowl in the rice cooker is usually removable, and beneath it lies a spring and thermostat. These form the main components of the rice cooker. The spring in the bottom is simply to ensure contact of the thermostat to the base of the cooking bowl. During cooking the mixture is continuously heated. The temperature cannot go above the boiling point of water—100°C (212°F)—as any energy put into the system at that point will only cause the water to boil. At the end of cooking all of the water will have been evaporated or absorbed by the rice. Once the heating continues past this point, the temperature exceeds the boiling point. The thermostat then trips, and switches the rice cooker to "warm" mode, keeping the rice no cooler than approximately 65°C (150°F). Simple rice cookers, like the one below, may simply turn off at this point.