This instrument is especially designed for use in the classroom to demonstrate the conversion of mechanical to electrical energy, and to show whether or not crank speed affects spark production.
This hand driven model does not require electric power.
It is supplied on a base
The generator is self exiting and charge separation occurs.
A metal sphere with a diameter of 150mm surrounds the upper pulley and charge accumulates on the sphere, which is insulated by a plastic column supporting the pulley assembly.
One can control the speed with the hand crank.
Includes the discharging sphere and instructions.
With this device, students will get a clear picture about the operating principle of a van de graaff generator, wherein the rubber belt driven by the pulley acquires a positive charge which it transfers to the outer surface of the dome that gets an increasingly positive charge in respect to earth. This ‘charge pumping’ effect is cumulative until a voltage on the large dome is sufficient to cause a spark discharge between the dome and the discharge ball.