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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    If a line having a total resistance \[0.2\Omega \] delivers 10kW at 250 volts to a small factory, then efficiency of transmission is

    A)  97%                        

    B)         87%

    C)  83%                      

    D)         76%

    Correct Answer: A

    Solution :

     Power lost\[={{i}^{2}}R\]                         \[={{\left[ \frac{(10,000)}{250} \right]}^{2}}\times 0.2\]                        \[=320\,\,watt=0.32\,\,kW\]      Efficiency\[=\frac{Power\,\,delivered\,\,by\,\,line}{Power\,\,supplied\,\,to\,\,line}\]                       \[=~\frac{10kW}{(10+0.32)kW}\]                       \[=0\times 97=\mathbf{97%}\]


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