Van de Graaff Generator
The Van de Graaff generator is a device capable of creating a huge electrostatic charge. It does this using only a rubber belt, two rollers and a metal sphere. The electric motor is optional.
Explanation of the belt and roller working together to charge the belt.
Explanation of the charge being deposited on the upper sphere.
The Theater of Electricity is an online exhibit put on by the Massachusetts Museum of Science. They have some incredible pictures and movies of their gigantic Van de Graaff generators in use. They also have a history of the Van de Graaff that is worth seeing.