AC Generator General Information

General information about AC generators

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Alexander Hood
AC generators
When a wire is moved in a magnetic field, the movement, magnetic field and current are all at right
angles to each other. If the wire is moved in the opposite direction, the induced current also moves in
the opposite direction.
One simple example of a generator is the bicycle dynamo. The dynamo has a wheel that touches the
back tyre. As the bicycle moves, the wheel turns a magnet inside a coil. This induces enough
electricity to run the bicycle's lights.
The faster the bicycle moves, the greater the induced current and the brighter the lights.
One side of a coil in an AC generator moves up during one half-turn, and then down during the next
half-turn. This means that, as a coil is rotated in a magnetic field, the induced current reverses
direction every half-turn.


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