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  • Question

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


  • Options
  • A. 0.3
  • B. 0.4
  • C. 0.6
  • D. none

  • Correct Answer
  • 0.6 

    Explanation
    Vs = 10 cos ?t,

    Let I be the current, then P = I2 R

    I is the rms current.

    ⟹ Prms = In a circuit of figure, Vs = 10 cos(?t) power drawn by the 2? resistor is 4 watts. The power factor I2 R ⟹ 4 ⟹ I2 = 4 ⟹ I = 2A.

    Total power drawn = In a circuit of figure, Vs = 10 cos(?t) power drawn by the 2? resistor is 4 watts. The power factor Vm Im cos ?

    ⟹ In a circuit of figure, Vs = 10 cos(?t) power drawn by the 2? resistor is 4 watts. The power factor 10 x 2 cos ? = 10 cos ?

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

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