JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors Question Bank Heating Effect of Current

  • question_answer 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 [CBSE PMT 1998; KCET (Engg.) 1999; MP PMT 2003]

    A)            10 watt                                   

    B)            30 watt

    C)            10/3 watt                              

    D)            90 watt

    Correct Answer: D

    Solution :

                       In series \[{{P}_{S}}=\frac{P}{n}\] Þ \[10=\frac{P}{3}\] Þ \[P=30\,W\] In parallel \[{{P}_{P}}=nP\] = 3 ´ 30 = 90 W

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