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Edison effect:the phenomenon of the flow of electric current when an electrodesealed inside the bulb of an incandescent lamp is connected to thepositive terminal of the lamp.

The "Edison effect" was the name given to a phenomenon that Edison observed in 1875 and refined later, in 1883, while he was trying to improve his new incandescent lamp. The effect was that, in a vacuum, electrons flow from a heated element -- like an incandescent lamp filament -- to a cooler metal plate. Edison saw no special value in the effect, but he patented it anyway. Edison patented everything in sight. Today we call the effect by the more descriptive term, "thermionic emission."

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