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Uttarakhand PMT Uttarakhand PMT Solved Paper-2005

  • question_answer
    A hot electric iron has a resistance of 80\[\Omega \] and is used on a 200 volt source. The electrical energy spent, if used for 2 hrs, is:

    A)  8000Wh         

    B)  2000Wh

    C)  1000Wh         

    D)  500Wh

    Correct Answer: C

    Solution :

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


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