what happen when an electric current is passed through the filament of the bulb
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The filament gets heats up and starts to glow.
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Explanation:
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a wire filament heated to a high temperature, by passing an electric current through it, until it glows with visible light (incandescence).The hot filament is protected from oxidation with a glass or quartz bulb that is filled with inert gas or evacuated. In a halogen lamp, filament evaporation is prevented by a chemical process that redeposits metal vapor onto the filament, extending its life.
The resistance of wires used inside bulb is very high so on passing current it glows.
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