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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.
Rotating 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.
The top of the dynamo is
touched against the rim of the
tyre
which rotates when the bicycle is moving.
Links
Electromagnetism
Induced Current
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