Questions
If voltage across a bulb rated 220 V and 100 W drops by 2.5% of its rated value, by which the power would decrease is,
detailed solution
Correct option is A
Given ΔVV×100%=2.5%P=V2R error in R=0ΔPP×100%=2ΔVV×100%=2×2.5%=5%Talk to our academic expert!
Similar Questions
Two 1000 W heaters when connected in parallel across 220 V supply produce heat Hp in time t. If they are connected in series across the same power supply, the heat produced in the same time is HS. What is (HP / HS) ?
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