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Electric light


Type	Depends on type of light
Working principle	Luminescence by electricity
Invented	1809 by Humphry Davy (arc lamp)
First production	1879 by Joseph Swan and Thomas Edison (first demo of incandescent bulb)
Electronic symbol

Electric light - Wikipedia
en.wikipedia : wiki : Electric_light

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Essentially, the lightbulb is a very thin filament of hard-to-melt metal tungsten, usually encased in a glass bulb filled with inert gases so that the filament doesn't oxidise and disintegrate. The electricity causes the wire to glow and a portion of that energy is turned into light.

How does a lightbulb actually work? - BBC
bbc : future : article : 20131101-how-does-a-lightbulb-work

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