Questions
Three equal resistors connected in series across a source of e.m.f. together dissipate 10 watts of power. What would be power dissipated if the same resistors are connected in parallel across the same source of e.m.f.
detailed solution
Correct option is B
We know that P=V2/RWhen resistances are connected in series, then R = 3RWhen resistances are connected in parellel, thenR2=R/3∴ 10=V23R and P=V2(R/3)=3V2Ror P10=9 or P=90 wattTalk to our academic expert!
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