Question

Which best compares a brush and a commutator in an electric motor?

Both rotate when the motor is on.
Both carry electrical current from a power source.
Both remain stationary when the motor is on.
Both have a permanent magnetic field.

Answer 1

Both carry electrical current from a power source.

Explanation: Brushes are the stationary contacts that deliver current to the rotating commutator; the commutator (rotating) conducts that current into the armature windings and reverses it to maintain torque.