First slide

Electrical power

Question

Statement 1: Two bulbs of same wattage, one having a carbon filament and the other having a metallic filament are connected in series. Metallic bulb will glow more brightly than carbon filament bulb.
Statement 2: Carbon is a semiconductor.

Easy

A

Both statements 1 and 2 are correct
B

Statement 1 is correct statement 2 is incorrect
C

Statement 1 is incorrect statement 2 is correct
D

Both statements 1 and 2 are incorrect

Solution

In series, current remains same. So, power P is proportional to resistance R, i.e, $P \propto R$ . Now, resistance of carbon is more than a metal since carbon is a nonmetal. So, carbon filament glows more brightly. Also, carbon is not a semiconductor.

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