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Question

Explain the use of brushes in A.C Generator.

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Solution

For certain types of electric motors or generators to function, the coils of the rotor must be connected to complete an electrical circuit. To accomplish this, a copper or brass commutator or 'slip rings' are affixed to the shaft, and springs press braided copper wire 'brushes' onto the rings which conduct the current.
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Carbon brushes are used to conduct electrical current between moving parts and stationary wiring.

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