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 1 kilowatt hour of power is Rs. 1.25. The cost of using this lamp for 8 hours is                                                                            [KCET 1994]

    A)            Rs. 1.20                                   

    B)            Rs. 4.00

    C)            Rs. 0.25                                   

    D)            Rs. 0.60

    Correct Answer: D

    Solution :

                       Total energy consumed \[=\frac{60\times 8}{1000}=0.48\,\,kWH\]            So cost \[=0.48\times 1.25=0.6\,\,Rs.\]


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