To turn the dynamo in order to make electricity.
A bicycle dynamo generates electricity to power bicycle lights. It uses the mechanical energy generated by the movement of the wheels to produce electricity.
The output from the dynamo varies with the speed of the bicycle. And as a geared bicycle is likely(but don't have to) travel a bit faster than the single speed, it may produce a bit more electricity.
The generator
Either a battery or a dynamo.
A bike dynamo may power a small radio, but you'd have to turn it on manually first.
It'd be rare to have a dynamo actually IN the rear wheel, far more common to have it at the side of it, driven by pushing against the tire. The purpose of a dynamo is to provide power to bicycle lights. A bicycle dynamo functions just like any other dynamo of the same principle - expose a coil of electric wire to a changing magnetic field and you get a current out of it.
Go to a bicycle shop, or the bicycle accessories aisle on a big department store and ask a clerk for bicycle dynamo.
It converts mechanical energy into electric energy. .
Yes, it is possible to convert the rotational motion of a bicycle wheel into electrical energy using a device called a dynamo. A dynamo is a small generator that contains magnets and a coil of wire. When the bicycle wheel turns, it spins the dynamo, generating electricity that can be used to power lights or charge batteries.
A dynamo is a type of electrical generator. On a bicycle it is in contact with the wheels, so that it spins when the bike is moving. That spinning is turned into electricity, which can be used to power bicycle lights.
It converts mechanical energy into electric energy.