RAJASTHAN PMT Rajasthan - PMT Solved Paper-2002

  • question_answer
    Real power consumption in a circuit is least when it contains :

    A)  high R low L  

    B)                        high R high L

    C)  low R high L      

    D)         high R low C

    Correct Answer: C

    Solution :

    Power consumption \[={{I}_{rms\,}}{{V}_{rms}}\cos \phi \] Where \[\cos \phi \] is power factor, \[\cos \phi =\frac{R}{Z}\] for \[\phi \] to be minimum, R should be minimum and Z should be higher. So higher Z  (impedence) L (inductance) should be high.


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