Question

Commutator is a device in a d.c. motor which:

Options

• increases the power

• reverses direction of current coil after full rotation of coil

• reverses direction of current after half rotation of coil

• increases the strength of electromagnet

Answer 1

Reverses direction of current after half rotation of coil

Explanation:

A commutator consists of split rings that reverse the direction of current in the coil after every half rotation, so the coil continues to rotate in the same direction. It does not increase power, magnetic strength, or reverse current after a full rotation.