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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
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.
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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 |
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.
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