Inventor : Nikola Tesla
What is it?
A plasma lamp.
What is it made of?
A spherical transparent glass containing mixture of noble gases and a high voltage electrode at the center.
How does it work?
When a 3-5 kV alternative current of 35kHz is applied to the electrode, the gas in the globe ionizes which enables it to conduct electricity., current flows towards the glass.
The difference in electrical potential between the electrode and the atmosphere causes current to flow towards the glass.
The glass acts as dielectric and ionizes the atmospheric air molecules.
The excited ions in the globe de-excite by emitting photon.