The filament, typically made of tungsten, is heated to a very high temperature by the electric current passing through it. This high temperature causes it to emit light (incandescence).
Temp. of Bulb Filament on lighting is:
Asked in RPSC RAS Prelims 2007 · Topic: Heat and Thermodynamics (Blackbody Radiation and Laws (Stefan-Boltzmann, Wien's Displacement))
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