Principles and constructions of dynamo
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The commutator is needed to produce direct current. When a loop of wire rotates in a magnetic field, the magnetic flux through it, and thus the potential induced in it, reverses with each half turn, generating an alternating current.
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principal of dynamo is electromagnetic induction. it contains two magnets opposing each other and they are joined with lace of copper when magnet or lace moves it produces electricity.
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