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An incandescent light bulb is supplied with a constant potential difference of 120 volts. As the filament of the bulb heats up, its resistance...

  1. increases and the current through it decreases

  2. increases and the current through it increases

  3. decreases and the current through it decreases

does anyone know the answer? thanks.

2 Answers

  • The resistance increases with temperature increase so by Ohm's Law I = V/R the current will decrease

    So the ans is 1

  • 1. increases and the current through it decreases

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