commutator - WordReference.com Dictionary of English

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commutator

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Concise Oxford English Dictionary © 2008 Oxford University Press:
commutator /ˈkɒmjʊˌteɪtə/

▶noun

1 an attachment, connected with the armature of a motor or dynamo, through which electrical connection is made and which ensures the current flows as direct current.

2 a device for reversing the direction of flow of electric current.

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