sciencing.com
How To Create A Magnet Dynamo
A dynamo, short for dynamoelectric machine, is another name for an electric generator. Dynamos use moving magnets inside a closed circuit to convert mechanical energy into an electric current. A simple example of a dynamo is a bicycle light that uses the friction produced by a rotor against the rotating bike tire to move magnets inside a coil of wire and light a bulb. You can create an alternating current magnet dynamo that lights a small bulb with a safe current of less than 2 volts.
