How Hair Dryers Work | HowStuffWorks
2009-8-25 · To ensure that the air coming out of the barrel never nears this temperature, hair dryers have some type of heat sensor that trips the circuit and shuts off the motor when the temperature rises too much. This hair dryer and many others rely on a simple bimetallic stripas a cut off switch. A bimetallic switchis made out of sheets of two metals. Both metals expand when heated, but at different rates.
Get Price