Principle of electric fan
We know that the most important material of an electric fan is the motor. Only when the engine is running can the fan blades rotate. So why does the electric fan motor run? The principle is as follows: the powered coil is forced to rotate in the magnetic field. After the electric fan is powered on, the positive and negative alternating current generates a magnetic field, which makes the energized coil of the motor rotate under the force, and the rotating shaft and fan blades rotate, converting electrical energy into mechanical energy. During the energy conversion process, part of the energy is converted into thermal energy and transferred to the outside, thereby releasing heat.
Electric fans heat but not cool
We use electric fans to cool, notnot because electric fans themselves can cool. Not only do they not cool, but they also increase heat. through energy conversion. But why can an electric fan cool people? The principle of evaporation and heat absorption is used here. But when people are hot, they expel sweat outward. The fan accelerates airflow to promote sweat evaporation and absorbs body heat to achieve cooling.
The electric fan is stained with dust
There is another question that bothers many friends: why does the electric fan blow air outside while the fan blades get a pile of dust after being used. for a period of time. Shouldn't the dust be blown away by the wind? In fact, this is due to the fact that the friction between the fan bladestor and air generates static electricity on the fan blades, which can absorb tiny particles in the air, and over time, a lot of dust will adhere. to this.