The motor spins the fan. Air is drawn in through the openings on the side of the hair dryer. You'll see this referred to in the manual accompanying the hair dryer as high or low speed, because changing the airflow involves modulating the speed at which the motor is turning. This is accomplished very simply, by altering the current flowing through the part of the circuit feeding the motor. When the power supplied is low, the motor and thus the fan spin slowly.
Less air is pushed through the hair dryer.
With more power, the motor speeds up. The fan rotates rapidly, drawing in more air and increasing the airflow. Two switches regulate whether and how much current flows through the hair dryer circuitry. Inc. All rights reserved. Simply register for a free Postbox in the country where your merchant is located.