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CMC Medical CMC-Medical VELLORE Solved Paper-2011

  • question_answer
    An electric bulb has power rating of 60 W, 220 V. If it is connected to a source of rms voltage 110 V, the power consumed is

    A)  125 W                                  

    B)  15 W

    C)  30 W                                    

    D)  60 W

    E)  40 W

    Correct Answer: B

    Solution :

                    Resistance \[R=\frac{{{V}^{2}}}{W}=\frac{220\times 220}{60}\] Now, power consumed is \[W=\frac{V{{}^{2}}}{R}=\frac{\frac{110\times 110}{220\times 220}}{60}\]       \[=15\,W\]


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