Why does a metal filament bulb glow when electric current passes through it?
The filament offers resistance, converting electrical energy to heat and light
A bulb's filament, usually made of tungsten, has a high electrical resistance and a very high melting point.
When current flows through the filament, its resistance opposes the flow of charge, converting electrical energy into heat energy according to the heating effect of current.
The filament heats up to a very high temperature and becomes incandescent, emitting visible light.
Hence, the filament's resistance converts electrical energy into heat and light, causing the bulb to glow.
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