Questions
The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp when not is use ?
detailed solution
Correct option is B
We know thatP=V2R or R=V2P∴ R=(200)2100=400 When in use Now, the resistance when it is not in use=R10=40010=40ΩTalk 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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