Q. Three equal resistors connected in series across a source of e.m.f. together dissipate 10 watt. If the same resistors are connected in parallel across the same e.m.f., then the power dissipated will be
A) $10\ watt$
B) $30\ watt$
C) $10/3\ watt$
D) $90\ watt$
Explanation
(d) $In\ series\ P_{S} = \frac{P}{n} \Rightarrow 10 = \frac{P}{3} \Rightarrow P = 30\ W$
$In\ parallel\ P_{P} = nP = 3 \times 30 = 90\ W$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.