Questions
There are two electric bulbs of 40 W and 100 W. Which one will be brighter when connected in series and when in parallel?
detailed solution
Correct option is A
R1R2 = P2P1 = 10040 = 52. Resistance of 4o w bulb is 52 times than 100 W. In series, P=i2R and in parallel, P=V2R So 40 W in series and 100 W in parallel will glow brighter.Talk to our academic expert!
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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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