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Hub dynamo
Electrical generator in a bicycle wheel / From Wikipedia, the free encyclopedia
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A hub dynamo is a small electrical generator built into the front hub of a bicycle wheel that is usually used to power lights. Often the hub "dynamo" is not actually a dynamo, which creates DC, but a low-power magneto that creates AC. Most modern hub dynamos are regulated to 3 watts at 6 volts, although some will drive up to 6 watts at 12 volts.
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![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/1/17/Schmidt_hub_dynamo_disk_brake.jpg/640px-Schmidt_hub_dynamo_disk_brake.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/4/42/Shimano_dynamo_hub.jpg/640px-Shimano_dynamo_hub.jpg)