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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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