Van de Graaff generator

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. It was invented by American physicist Robert J.

Van de Graaff in 1929.
The potential difference achieved by modern Van de Graaff generators can be as much as 5 megavolts (MV).
An inexpensive tabletop version can produce on the order of 100 kV and can store enough energy to produce visible electric sparks.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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