A commutator is a type of rotating switch that changes the connections to the load circuit at the same instant as the emf reverses in the armature.

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Quizplus · Accepted Answer

A commutator is indeed a rotating electrical switch used in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit, ensuring that the current flow to the load circuit changes at the same time as the electromotive force (emf) reverses in the armature. This is essential for the proper functioning of DC motors and generators.

A Commutator Is a Type of Rotating Switch That Changes