An electric generator
An electric generator works in reverse of an electric motor.
Explanation:
In an electric generator the permanent magnet is span by a small piston engine powered by fuel. Which is why we put petrol/diesel in an electric generator. The crankshaft of the engine spins a permanent magnet surrounded by a coil of wires with many wounds. An electric current is induced in the coil of wire by dynamo effect - the more the wounds of the coil, the bigger the induced current This also observes the Fleming's rule of the thumb (right hand in this case) on electric induction.
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