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

  • question_answer A hot electric iron has a resistance of \[80\,\Omega \] and is used on a 200 V source. The electrical energy spent, if it is used for two hours, will be                                 [Pb. PET 2002]

    A)            8000 Wh                                  

    B)            2000 Wh

    C)            1000 Wh                                  

    D)            800 Wh

    Correct Answer: C

    Solution :

               Energy \[\frac{{{V}^{2}}}{R}t=\frac{200\times 200\times 2}{80}=1000\,Wh\]

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