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J & K CET Engineering J and K - CET Engineering Solved Paper-2003

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

    A)  \[33.3\text{ }W\]

    B)  \[66.7\text{ }W\]

    C)  \[300W\]

    D)  \[100W\]

    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,  \[{{P}_{1}}=200W,\,\,\,\,\,\,{{P}_{2}}=100W\] \[\Rightarrow \] \[\frac{1}{P}=\frac{1+2}{200}\] \[\Rightarrow \] S\[P=\frac{200}{3}=66.7W\]


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