subject: Understanding Hair Dryer Working [print this page] A hair dryer is a simple electrical device which works by the rotation of a fan present inside it. It has got a heating coil also. Apart from just blow drying your hair, it helps in styling also.
Hair dryers work on battery as well as with an ac current source. When it is connected to a current supply, it is energized. The small ac motor fixed inside the hair dryer receives the energy and turns on. This in turn will rotate the fan connected to the shaft of the ac motor. The fans blades are shaped in such a way so as to produce airflow. It is directed outward through the vent of the hair dryer.
The hair dryer consist of two vents. They are the air inlet vent and the outlet when the fan starts rotating air from the outside in drawn in. There is a safety screen fixed at the inlet to prevent unnecessary objects from entering the hair dryer. The air which is sucked in passes through the barrel and forced outwards directing to your hair. The main heating process takes place in between this.
The hot air of the hair dryer is produced as a result of the heating of a coiled wire placed in front of the fan. The coiled wire is made of materials that are poor conductors of electricity. Or in other words they offer resistance to the flow of electricity. This results in power loss in the material in the form of heat. Thus the coil heats up. The amount of heat produced by the coiled wire depends upon how much electric charge is pumped through the coil. It is directly proportional to the flow of current through it. The coiled wire is also rust free. It does not corrode due to oxidization. The design of the casing is done in such a way that the air from the fan is directed towards the coiled before being let out. This makes the air warm and hence we receive hot air at the outlet of the hair dryer.
A number of technological advancements have taken place in its working and design since its invention. They are very safe and make styling very easy.
