It consists of a heat source, a cooking bowl, and a thermostat. The thermostat measures the temperature of the cooking bowl and controls the heat. Complex rice cookers may have many more sensors and other components, and may be multipurpose.Rice Cooker cooking information, facts and recipes. An electric kitchen appliance used to cook rice. It prepares the rice automatically, knowing when the rice reaches the proper temperature, it will switch from a cooking mode to a warming mode.