write the role of carbon brushes in an AC generator
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The primary function of carbon brushes is to deliver or collect current from a rotating part of an electric machine. The brushes should maintain a close contact with rotating part (commutator or slip rings) in order to ensure sparkles operation without wearing itself too quickly.
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The slip rings or split rings can also rotate the circuit, i.e. battery too. In order to prevent such situation, brushes are just in touch with the rings so that the current can pass without any harm to battery.
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