Plasma Ball. Plasma lamps are available in spheres and cylinders. plasma lamp is usually a clear glass orb.
The plasma lamp was invented by Nikola Tesla after his experimentation with high frequency currents in an evacuated glass tube for the purpose of studying high voltage phenomena. Tesla called this invention an inert gas discharge tube. Most commonly, Plasma lamps are available in spheres and cylinders. Although there are many variations, a plasma lamp is usually a clear glass orb, filled with a mixture of various gases at low pressure, and driven by high frequency alternating current at high voltage (approx. 35 kHz, 2–5 kV), generated by a high voltage transformer. A much smaller orb in its center serves as an electrode. Plasma filaments extend from the inner electrode to the outer glass insulator, giving the appearance of multiple constant beams of colored light (see corona discharge and electric glow discharge). The beams initially follow the electric field lines of the dipole, but move upwards due to convection. Placing a hand near the glass alters the high-frequency electric field[citation needed], causing a single beam to migrate from the inner ball to the point of contact. An electric current is produced within any conductive object near the orb, as the glass doesn't block the electromagnetic field created by the electric current flowing through the plasma (though the insulator does block the current itself). The glass acts as a dielectric in a capacitor formed between the ionized gas and the hand
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