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

  • question_answer How many calories of heat will be produced approximately in a 210 watt electric bulb in 5 minutes           [Pb. PET 2004]

    A)            80000 cal                                 

    B)            63000 cal

    C)            1050 cal                                   

    D)            15000 cal

    Correct Answer: D

    Solution :

               \[H=\frac{{{V}^{2}}t}{R\times J}\,Calories=\frac{P\,t}{J}=\frac{210\times 5\times 60}{4.2}=15000\,cal\]


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