Spark image

The d.c. electric motor

The animation shows the working of a d.c electric motor. Notice that as the coil rotates the forces on it remain the same but reverse in direction as the coil rotates and the current direction through the coil changes. The torque on the coil varies, being a maximum when the plane of the coil is in the same direction as the magnetic field and zero when the coil is perpendicular to the magnetic field.

© Keith Gibbs and John Bourne 2014