A Van de Graaff generator is an electrostatic generator which uses a moving belt to accumulate electric charge on a hollow metal globe on the top of an insulated column, creating very high electric potentials. It produces very high voltage direct current (DC) electricity at low current levels. A tabletop version can produce on the order of 100,000 volts and can store enough energy to produce a visible spark. It was invented by Robert J. Van de Graaff in 1929.