Working of Electric Filament Heaters:

Appliances that heat up, such as a hair dryer, a clothes iron, toaster, electric toaster oven, or an electric space heater all work on the same idea. They change electrical energy to heat energy. The devices all plug into a source of electricity. Electric current runs from your wall socket down the wire and into the appliance. Inside each of the appliances are loops of special mixture of metals. One type is called nichrome . Nichrome …

…the same time, it shuts off the electricity. In some newer toasters, the thermocouple is replaced by a small timer. In a hair dryer, a small fan is turned on at the same time the heater coils are turned on. The moving air is forced over the glowing wires, warming the air. The warm air blows out of the front of the hair dryer and causes the water in your hair to evaporate and dry.