I'm in the middle of a project. I am planning on building a "perpetual motion" machine. I know this is impossible. The shape of the machine is a wheel (picture below). The wheel does spin for a while, and during that time I want to create electrical energy with it. With this energy I want to charge a battery that will then power a device that will make the wheel spin again whenever it stops. I don't know much about how to go about this project. I think a may need a dynamo and a resistor (and a few more things). I'm afraid of building this wheel and then not be able to produce the amount of voltage needed to charge the battery. Does the diameter of the wheel matter? How fast it spins? The size of the wheel is of exactly 1 ft. Any help would be much appreciated.