Questions
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.
detailed solution
Correct option is D
In series, current remains same. So, power P is proportional to resistance R, i.e, P ∝ 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.Talk to our academic expert!
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A resistor R is connected across a battery of emf 12 V. It observed that terminal potential differenceis 9 V and the power delivered to resistor is 18 W. Internal resistance of the battery ‘r’ and the resistance R are respectively
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