Generators
If a wire or a coil of wire cuts through at right angles to a magnetic field, a potential differnce is generated across the ends of the wire
If a magnet is moved in or our of the coil or wire, a potential difference is induced across the ends of the coil
The direction of the induced potential difference is reversed if;
The direction of the generator is reversed
The direction of the magnetic field is reversed
The size of the induced potential difference or current can be increased if;
The speed of movement is increased
The strength of the magnetic field is increased
The number of turns is increased
An a.c current consists of a coil of wire that is turned into a magnetic field. The coil of wire is connected to the circuit by two slip brushes that always stay in contact with the two circular carbon rings, which rotate with the coil
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