A bike dynamo may power a small radio, but you'd have to turn it on manually first.
To turn the dynamo in order to make electricity.
A bottle dynamo generates electricity for bicycle lights by using a wheel to turn a small generator inside the dynamo. As the wheel spins, it creates a magnetic field that induces an electric current in the generator, which then powers the lights on the bicycle.
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 bicycle dynamo light works by using the rotation of the bicycle wheel to generate electricity. This electricity powers a light bulb, providing illumination while cycling.
i know how but i'am having a problem of explaining
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.
To properly connect a Shimano dynamo hub connector to your bicycle's lighting system, follow these steps: Locate the dynamo hub connector on your bicycle wheel. Identify the corresponding connector on your lighting system. Align the connectors and firmly push them together until they click into place. Test the connection by spinning the wheel to generate power and ensure the lights turn on. Ensure the connectors are securely connected to prevent any issues while riding.
It converts mechanical energy into electric energy. .
Go to a bicycle shop, or the bicycle accessories aisle on a big department store and ask a clerk for bicycle dynamo.