 Other electrostatic machines like the Wimshurst machine or Bonetti machine work similarly to the Van De Graaff; charge is transported by moving plates, disks, or cylinders to a high voltage electrode.For these generators, however, corona discharge from exposed metal parts at high potentials and poorer insulation result in smaller voltages.In an electrostatic generator, the rate of charge transported (current) to the high-voltage electrode is very small.