Phasors: power, apparent power and theta

Discussion in 'Homework Help' started by paul_alan, Dec 7, 2011.

  1. paul_alan

    Thread Starter Member

    Nov 5, 2011
    43
    0
    I'm having some trouble with some formulas, maybe someone could help me...A pure capacitance load draws 6A from an 80V source. Determine the power, apparent power and theta. I'm confused as to which value goes on the x-axis and which goes on the y-axis. I want to say current is the x because it's a constant in a series circuit, but i see some phasors are drawn differently. any help is greatly appeciated.
     
  2. EL7819

    New Member

    Apr 15, 2011
    20
    0
     Total Apparent Power=St=sqrt(Pt^2+Qt^2)

     P/S=P_{f}

     P=average power=Watts=VA cos theta

     S=apparent power=VI=VA

    Q=reactive power=VAR=VI sin theta
     
    Last edited: Dec 7, 2011
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Are you wanting to draw a phasor diagram for this case?
     
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