Bottle dynamo
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A bottle dynamo or sidewall dynamo is a small electrical generator for bicycles employed to power a bicycle's lights. The traditional bottle dynamo is not actually a dynamo at all, but a low-power mag
Bottle dynamo mounted on a bicycle
Dismantled bottle dynamo. Left: Housing with internal permanent magnet rotating together with the friction wheel. Right: Induction coil
Dynamo
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A dynamo is an electrical generator that creates direct current using a commutator, and uses self-powering electromagnets for the stator field rather than permanent magnets. Dynamos are self-starting
Bottle dynamo
…dynamo is a small electrical generator for bicycles employed to power a bicycle's lights. The traditional bottle dynamo (pictured) is not actually a dynamo at all (which creates DC power), but a low-power magneto that generates AC. Newer models can include a rectifier to create DC output to charge batteries…
The Faraday disk was the first electric generator. The horseshoe-shaped magnet (A) created a magnetic field through the disk (D). When the disk was turned, this induced an electric current radially outward from the center toward the rim. The current flowed out through the sliding spring contact m (connected to B') through the external circuit, and back through B to the center of the disk through the axle
Hippolyte Pixii's dynamo. The commutator is located on the shaft below the spinning magnet
Pacinotti dynamo, 1860
The Woolrich Electrical Generator in Thinktank, Birmingham