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VMMC VMMC Medical Solved Paper-2011

  • question_answer
    The \[rms\] value of AC current which when passed through a resistor produces heat energy four times that produced by DC of 2 A through the same resistor in same time, is

    A)                 32 A                                      

    B)  2 A                        

    C)                 4 A                         

    D)         8 A

    Correct Answer: C

    Solution :

                            Heat produce by DC \[H=i_{DC}^{2}Rt\]                                                          ?(i) \[=4Rt\] Heat produced by AC \[4H=i_{rms}^{2}Rt\]                                     ?(ii)                 \[\therefore \]  \[\frac{4H}{H}=\frac{i_{rms}^{2}Rt}{4Rt}\]                 or            \[{{i}_{rms}}=4A\]


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