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Manipal Medical Manipal Medical Solved Paper-2002

  • question_answer
    A hot electric iron has a resistance of 80 n and is used on a 200 V source. The  electrical energy spent, if it is used for hr, will be:

    A)  8000Wt        

    B)  2000Wt

    C)  1000Wt        

    D)  800Wt

    Correct Answer: C

    Solution :

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


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