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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    An electric bulb rated 200 V and 100 W is connected to a 160 V power supply. The power consumption would be

    A)  64 W                                      

    B)  80 W

    C)  100 W                  

    D)         125 W

    Correct Answer: A

    Solution :

                    \[P\propto {{V}^{2}}\] So,          \[\frac{{{P}_{2}}}{{{P}_{1}}}={{\left( \frac{{{V}_{2}}}{{{V}_{1}}} \right)}^{2}}\] or            \[{{P}_{2}}=100{{\left( \frac{16}{20} \right)}^{2}}=100\times \frac{16}{25}=64\]


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