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Bicycle Dynamo.
A small generator
is sometimes fitted to a bicycle
A permanent magnet is rotated
in the middle of coils
of wire.
to provide electricity for the lights at night.
This has the advantage that slip rings
are not needed
because the outer coils
do not move.
The top of the dynamo
is touched against the rim of the tyre
which rotates when the bicycle
is moving.
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