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Question

Three equal resistors connected across a source of e.m.f. together dissipate 10 watt of power. What will be the power dissipated in watts if the same resistors are connected in parallel across the same source of e.m.f ?

A
10
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B
103
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C
30
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D
90
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Solution

The correct option is D 90

In series, Equivalent resistance = 3R
Power=V23R10=V23RV2=30R

In parallel, 1R=1R+1R+1R=3R

Equivalent resistance R=R3

Power =V2R=30RR/3=90W


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