Questions
A wire when connected to 220 V mains supply has power dissipation P1. Now the wire is cut into two equal pieces which are connected in parallel to the same supply. power dissipation in this case is P2. Then P2 : P1 is
detailed solution
Correct option is B
When wire is cut into two equal parts, then power dissipated by each part is 2P1So their parallel combination will dissipate power P2 = 2P1 + 2P1 = 4P1Which gives P2P1=4Talk 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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