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

  • question_answer A railway compartment is lit up by thirteen lamps each taking 2.1 amp at 15 volts. The heat generated per second in each lamp will be                                                     [J & K CET 2005]

    A)            \[4.35\,cal\]                          

    B)            \[5.73\,\,cal\]

    C)            \[7.5\,\,cal\]                         

    D)            \[2.5\,cal\]

    Correct Answer: C

    Solution :

                       The heat generated = IVt \[=2.1\times 15\times 1=31.5J\]                    \[=31.5/4.2\,\,cal\]\[=7.5cal.\]        \[[\because 1\,cal=4.2J]\]

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