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Discussion :: Analog Electronics

  1. In a circuit of figure, Vs = 10 cos(ωt) power drawn by the 2Ω resistor is 4 watts. The power factor is

    2. A.
    0.3
    B.
    0.4
    C.
    0.6
    D.
    none

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    Answer : Option C

    Explanation :

    Vs = 10 cos ωt,

    Let I be the current, then P = I2 R

    I is the rms current.

    Prms = I2 R 4 I2 = 4 I = 2A.

    Total power drawn = Vm Im cos θ

    10 x 2 cos θ = 10 cos θ

    Total power cannot be determine until value of R = 12 Ω is given.

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