Van de Graaff Generator start

Wikipedia:

vdgwikipedia.png

Schematic view of a classical Van de Graaff generator.

1) hollow metal sphere
2) upper electrode
3) metal upper roller
4) side of the belt with positive charges
5) opposite side of the belt with negative charges
6) plastic lower roller
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)