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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2009

  • question_answer
    In an AC circuit, the current is given by\[I=5\,\sin \,(100t-\pi /2)\] and the alternating potential is \[V=200\,\sin (100)t\] volt. The power consumed in the circuit is

    A)  20 W                    

    B)         40 W

    C)  1000 W               

    D)         zero

    Correct Answer: D

    Solution :

    \[I=5\sin (100t-\pi /2)\] \[V=200\,\,\sin \,\,100t\] Phase difference between alternating current and alternating voltage is\[n/\text{ }2\]. \[\therefore \]Power consumption\[(\bar{P})={{V}_{rms}}\cdot {{I}_{rms}}\cdot \cos \frac{\pi }{2}\]                                                   \[=0\]


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