JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors Question Bank Heating Effect of Current

  • question_answer An electric lamp is marked 60 W, 230 V. The cost of a 1 kWh of energy is Rs. 1.25. The cost of using this lamp 8 hrs a day for 30 day is                                                         [Kerala (Med.) 2002]

    A)            Rs. 10                                       

    B)            Rs. 16

    C)            Rs. 18                                       

    D)            Rs. 20

    Correct Answer: C

    Solution :

                       Total kWh consumed \[=\frac{60\times 8\times 30}{1000}=14.4\] Hence cost \[=14.4\times 1.25=18\,Rs\]

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