Question

From the following statement write down that which is applicable to a commutator.
a. A galvanometer uses a commutator for deadbeat
b. A transformer uses a commutator to step up voltage
c. A motor uses a commutator to reverse the current

Answer 1

A motor uses commutator to reverse the current.

Commutator is simply a mechanical rectifier used to reverse the direction of current every time coil moves through the plane perpendicular to the magnetic field. So as to keep the torque on a DC motor from reversing its direction.