A bottle dynamo, also known as a bottle generator or hub dynamo, is a type of mechanical device used to generate electrical power, primarily for bicycle lighting systems. The device consists of a small generator that is typically mounted on a bicycle frame, with a roller that presses against the bicycle tire (or rim) to generate electricity as the wheel turns. ### Key Features of a Bottle Dynamo: 1. **Mechanism**: It operates based on electromagnetic induction.
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