4.4+Dynamo

The Dynamo When you turn the handle fast enough, the light bulb flicks on. The slower you turn the handle, the less sustaned the light is. The energy starts in your hand as Chemical Potential Energy, which turns into Kinetic energy as you move the handle and then the Kinetic energy passes on to the cogs which turn (and some of the energy is lost as sound energy here) and the energy then passes through the wires as electrical energy. The electrical energy then reaches the filament in the light bulb and starts to burn it which gives off light and heat.

Well done. Here is a simpler diagram of a generator - basically a loop of wire spinning near a magnet. When you do this, voltage is generated and so electrical current starts to flow in the wire.