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J & K CET Medical J & K - CET Medical Solved Paper-2003

  • question_answer
    A 200 W and a 100 W bulb, both meant for operation at 220 V are connected in series. When connected to a 220 V supply the power consumed by the combination is :

    A)  33.3 W                                

    B)  66.7 W

    C)  300 W                                  

    D)  100 W

    Correct Answer: B

    Solution :

                    When two similar bulbs of different powers are connected in series, then \[\frac{1}{P}=\frac{1}{{{P}_{1}}}+\frac{1}{{{P}_{2}}}\] Given, \[{{P}_{1}}=200\text{ }W,\text{ }{{P}_{2}}=100\text{ }W\] \[\Rightarrow \]               \[\frac{1}{P}=\frac{1+2}{200}\] \[\Rightarrow \]               \[P=\frac{200}{3}=66.7\,W\]


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