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JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Kirchhoff's Law, Cells

  • question_answer
    A battery is charged at a potential of 15 V for 8 hours when the current flowing is 10 A. The battery on discharge supplies a current of 5 A for 15 hours. The mean terminal voltage during discharge is 14 V. The "Watt-hour" efficiency of the battery is                                                       [CBSE PMT 2004]

    A)            82.5%                                      

    B)            80 %

    C)            90%                                          

    D)            87.5%

    Correct Answer: D

    Solution :

               Watt hour efficiency\[=\frac{\text{Discharging}\,\,\text{energy}}{\text{Charging}\,\,\text{energy}}\]                    \[=\frac{14\times 5\times 15}{15\times 8\times 10}\]\[=0.875\]\[=87.5%\]


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