What is the purpose of a commutator in a DC machine?
A. To reverse the direction of current in the armature windings
B. To increase the efficiency of the machine
C. To convert AC to DC
D. To step up or step down the voltage
Explanation:
The commutator in a DC machine reverses the direction of current in the armature windings, ensuring that the torque produced in the machine is always in the same direction.