A hub dynamo is a small electrical generator built into the hub of a bicycle wheel that is usually used to power lights. 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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Famous quotes containing the word hub:
“There is no object so soft but it makes a hub for the wheel’d universe.”
—Walt Whitman (1819–1892)