A coil of wire carrying a current in a magnetic field experiences a force that tends to make it rotate. This effect can be used to make an electric motor.
The diagram shows a simple motor using direct current (dc).
Starting from the position shown in the diagram of the dc motor:
When the coil is vertical, it moves parallel to the magnetic field, producing no force. This would tend to make the motor come to a stop, but two features allow the coil to continue rotating:
This means that the current in the left hand part of the coil still causes a downward force, and current in the right hand part of the coil still causes an upward force.
This means that the motor effect forces continue to cause anti-clockwise rotation of the coil.
Electric motors affect almost every aspect of daily life. They can be found in homes, schools and even in cars.