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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2005

  • 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 hr, will be:

    A)  8000 Wh                             

    B)  2000 Wh

    C)  1000 Wh             

    D)         800Wh

    Correct Answer: C

    Solution :

    Here: Resistance\[R=80\,\Omega \] Voltage                  \[V=200\,V\] Time                         \[t=2\,hr\] The relation of power is given by \[P=\frac{{{V}^{2}}}{R}=\frac{{{(200)}^{2}}}{80}=500\,W\] Hence, energy spent is given by \[=power\times time\]     \[=500\times 2=1000\,Wh\]


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