The speed of an electric fan is directly related to the voltage supplied to it. When the voltage is low, the fan's speed decreases because the amount of power available for the fan to operate is reduced.
In an electric fan, the motor is responsible for driving the fan blades. The motor consists of coils of wire, known as windings, which create a magnetic field when an electric current flows through them. This magnetic field interacts with permanent magnets or other components within the motor, causing the motor to rotate.
The speed of the motor is determined by the frequency and voltage of the electrical power supplied to it. When the voltage is low, the motor receives less electrical power, resulting in a weaker magnetic field and reduced rotational force. As a result, the fan's speed decreases.
It's important to note that the relationship between voltage and speed may vary depending on the type of motor used in the fan. Some motors may be designed to operate optimally at specific voltages, while others may have mechanisms to compensate for varying voltages. However, in general, a lower voltage will lead to a slower fan speed due to the reduced power available for motor operation.