Van de Graaff Generator start

Wikipedia:

Schematic view of a classical Van de Graaff generator.

1) hollow metal sphere
2) upper electrode
3) upper roller (metal)
4) side of the belt with positive charges
5) opposite side of the belt with negative charges
6) lower roller (for example in acrylic glass)
7) lower electrode (ground)
8) spherical device with negative charges, used to discharge the main sphere
9) spark produced by the difference of potentials





As the motor spins, the belt travels around the two pulleys. Electrons are collected from the top via the electrode and travel down with the belt. The electrons jump off the belt onto the electrode at the bottom, and the belt travels back up positive (ready for more electrons)