The hair dryer has two switches; one operates the fan the other allows the current to pass through the nichrome coil. When the first switch is put on, the electric fan starts running and the cold air comes out form the dryer, and when the second switch is put on, the coil gets heated up and as a result, the air now passes over the heated coil and gets heated. The hot air blows moisture-laden air away from the hair, thus drying them.