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Derive an expression for power factor.

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Derive an expression for power factor.

    • Posted by Shivi Rajput 7 years, 4 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Kalindi Yadav 7 years, 4 months ago

    Ev Iv is apparent power or virtual power.

    1Thank You

    Kalindi Yadav 7 years, 4 months ago

    Power Factor of an AC circuit is defined as the ratio of true power to apparent power of the circuit. Since,P=Ev Iv cos ϕ Here,P is called true power,Ev Is is called apparent power or virtual power. Thus,Power Factor =True Power/Apparent Power=P/Ev Iv= cos ϕ=R/Z=Resistance/Impedance=R/√R²+(Xl-Xc)²(from Impedance triangle). Power Factor is always positive,but less than one or most equal to one.

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