why the bulb glow when electric current pass through?
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Electricity flows through a thin wire in the light bulb called the filament. ... Therefore as a result of this, the filament heats up and starts glowing, converting electrical energy to light energy. This is because of the Joule-effect, which means that resistances heat up when electrical current runs through them.
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As we know the heating of the tungsten metal of the bulb makes the bulb glow,so when electric current heats the metal it makes the bulb glow.
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