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J & K CET Medical J & K - CET Medical Solved Paper-2010

  • question_answer
    Two bulbs marked 60 W, 220 V and 100 W, 220 V are connected in series and the series combination is now connected across a 220 V mains supply. The power dissipated in the circuit is

    A)  37.5 W                                

    B)  75 W

    C)  80 W                                    

    D)  40 W

    Correct Answer: A

    Solution :

                                    When connected in series power dissipated \[{{P}_{S}}=\frac{{{P}_{1}}{{P}_{2}}}{{{P}_{1}}+{{P}_{2}}}\] \[=\frac{100\times 60}{100+60}=\frac{6000}{160}=37.5\]


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