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As the electric current in a lightbulb is slowly increased, the filament glows more and more brightly. Why does this happen?
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As the electric current in a lightbulb is slowly increased, the filament glows more and more brightly. Why does this happen?

User Barry Kelly
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It happens due to the inner resistance. Resistance causes heating of tungsten filament and with more resistance, a light bulb produces more light. 
User Stackoverblown
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