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Incandescent Lamps:
How They Work

Diagram of an incandesccent lamp

The glowing wire is called a filament. Filaments are made of materials that resist the flow of current.

Current flowing through a material of high resistance (like carbon or tungsten) generates heat and makes the material glow or become incandescent.

The power lines and lead wires are made with materials of low resistance like copper. Thus they do not get hot.



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