A device that transforms electrical energy into mechanical energy is known as an electric motor. It operates on the principle of the current magnetic effect. A simple electric motor is seen in the diagram below.
![](https://www.learnatnoon.com/s/in//wp-content/uploads/sites/8/2021/09/image-1209.png)
When the switch is closed and electricity is allowed to flow through the coil MNST, the coil begins to revolve in an anticlockwise direction. This is due to a downward force operating on the length MN and an upward force acting on the length ST at the same time. As a result, the coil rotates in the opposite direction as the clock. The magnetic fields act from left to right normal to the length MN, and current flows from M to N. A downward force acts along the length MN, according to Fleming’s Left Hand rule. The current travels from S to T along the length ST, and the magnetic field operates from left to right. As a result, along the length ST, an upward force acts. The coil rotates anti-clockwise due to the combined effects of these two forces. The positions of MN and ST swap every half a rotation. Brush B comes into touch with half ring C, and rush C comes into contact with half ring D. As a result, the current in the coil MNST is reversed.