2. Solved Papers
  3. VMMC

VMMC VMMC Medical Solved Paper-2002

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

    A)  8000 Wh

    B)                         2000 Wh             

    C)         1000 Wh             

    D)         800 Wh

    Correct Answer: C

    Solution :

    Here: resistance  \[R=80\Omega ,\]    voltage V = 200 V and time \[=2h\] Now the power is given by \[P=\frac{{{V}^{2}}}{R}=\frac{{{(200)}^{2}}}{80}=500\,\text{watt}\] Hence, energy spent = power \[\times \] time   \[=500\times 2=1000\text{ Wh}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner