Practice Question

1. Expain the function of the split ring commutator in an electric motor

Split ring commutator swaps the contacts every half turn, this allows the coil to rotate 360 degrees in one direction

2. Explain the function of brushes in an electric motor

Brushes allow a permanent electrical connection to the split ring commutator, but with free rotation.

3. Suggest what would happen if an alternating current were connected to a direct current brushed motor

The coil would vibrate forwards and backwards, rather than spinning in one direction because the direction of force is constantly changing.