An electric fan is a device that uses electricity to move air. Its components include a structure, which provides stability so that the air moved generally stays aimed where it is wanted. The electric motor is the thing that does the work to turn the fan blades, and the electrical supply, which provides the energy to make the motor spin.
An important benefit of electric fans is that they don’t waste power by blowing air over a cold engine, which is what happens with belt-driven fans. This allows the car to warm up more quickly, saving fuel and reducing wear on the engine and exhaust system.
Another advantage of electric fans is that they can be turned on and off, which cuts down on unnecessary consumption of electrical energy. It also reduces the noise generated by the fan when it is switched on and off, and it makes it possible to control its speed, which improves its efficiency and quietness.
Finally, an electric fan can be controlled by a pulse-width modulation (PWM) circuit, which uses the width of a train of on-off pulses to vary the power applied to the motor. This method of control is much more efficient than the old-fashioned on/off switch, and it produces less heat in the motor, which extends its lifespan. It is also quieter, which is especially useful in an office environment where the fan is used to silence a noisy colleague or cigar-smoking uncle.