A bottle dynamo or sidewall dynamo is a small electrical generator for bicycles employed to power a bicycle's lights — or to charge batteries for electronic devices including cellphones or GPS receivers.
Named after their resemblance to bottles, these generators are also called sidewall dynamos because they operate using a roller placed on the sidewall of a bicycle tire. When the bicycle is in motion and the dynamo roller is engaged, electricity is generated as the tire spins the roller.
Two other dynamo systems used on bicycles are hub dynamos and bottom bracket dynamos.
Other articles related to "bottle dynamo, dynamos, bottle dynamos":
... Slippage In wet conditions, the roller on a bottle dynamo can slip against the surface of a tire, which interrupts or reduces the amount of electricity generated ... Hub dynamos do not need traction and are sealed from the elements ... Increased resistance Bottle dynamos typically create more drag than hub dynamos ...
Famous quotes containing the word bottle:
“A baby nurse is one that changes diapers and loves em dearly. Get up at all hours of the night to give em the bottle and change their pants. If the baby coughs or cries, you have to find out the need. I had my own room usually, but I slept in the same room with the baby. I would take full charge. It was twenty-four hours. I used to have one day a week off and Id go home and see my own two little ones.”
—Ruth Lindstrom (c. 1892?)