Questions
An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 200C? The temperature of boiling water is
detailed solution
Correct option is B
Electric power consumed by kettle, P = 220 x 4 WHeat required,H=1000 × 1 100−20 = 1000 × 80 cal=4200 × 80 JP=Ht ⇒ H=P × t∴ 220 × 4 × t=4200 × 80 ⇒ T=6.3 minutesTalk 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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