Kelvin Water Dropper Capacitor or Electrostatic Generator

Shown is the construction and operation of a Kelvin Water Dropper capacitor followed by an explanation of how it works. This is essentially an electrostatic generator. Falling water drops are used to charge a capacitor. So gravitational potential energy is changed into stored electrical energy on a capacitor. When the stored electric energy is large enough, an electric field between two electrodes reaches the dielectric breakdown strength of air and a spark results.