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| Luminescence by electricity |
| 1809 by Humphry Davy (arc lamp) |
| 1879 by Joseph Swan and Thomas Edison (first demo of incandescent bulb) |
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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.
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