Shuttling Electric Charge

This simple demo shows how charges are built up on a metallic plate. Then an uncharged ball which is coated in graphite (conductor) picks up charges to become the same charge as the plate. Then the ball is repelled and moves towards a grounded plate offloading the charge. The pattern is repeated forming an electric current. The Physics is simple.... 1/T = f for the ball Q = It so you can sub in t for T in this case and in fact work out the charge flowed to the device and the number of electrons that has flowed. However you will need a nA to accomplish this in practice. This version shows me tapping off charge with a light bulb and also right at the end you can see when the ball is moving very fast it actually has small sparks!