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What is a Bicycle Dynamo?

A small generator is sometimes fitted to a bicycle to
provide electricity for the lights at night.
The generator is called a bicycle dynamo

How does a Bicycle Dynamo Work?

Inside the dynamo a permanent magnet is rotated
in the middle of some coils of wire.
the magnet instead of the coils has the
advantage that slip rings are not needed.
The rotating magnet produces a changing magnetic field
and this generates electricity in the coils of wire.

Bicycle Dynamo

The top of the dynamo is touched against the rim of the tyre
which rotates when the bicycle is moving.

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