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.

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.