What is a commutator in DC machines?

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answerhappygod
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What is a commutator in DC machines?

Post by answerhappygod »

a) electrical device which reverses the current direction between the rotor and external circuit
b) mechanical device which reverses the current direction between the rotor and external circuit
c) electrical device which allows the current flow between the rotor and external circuit
d) mechanical device which allows the current flow between the rotor and external circuit
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