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Manipal Medical Manipal Medical Solved Paper-2014

  • 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 used for 2h, is

    A) 8000 Wh                                 

    B) 2000 Wh

    C) 1000 Wh                                 

    D) 300 Wh

    Correct Answer: C

    Solution :

    Resistance. \[R=80\,\Omega \] Voltage,      \[V=200\,\,V\]                       \[t=2h\] The relation for power is given by \[D=P=\frac{{{V}^{2}}}{R}\] \[=\frac{{{(200)}^{2}}}{80}=500\,\,W\] The energy spent \[=power\times time\]  \[=500\times 2=1000\,\,Wh\]


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