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Homework Help: Power in RL circuit

  1. Nov 8, 2007 #1
    An AC source of 140V feeds 33A to a load,
    though a cable represented by an unknown
    resistance R in series with an unknown
    inductive reactance X. The manufacturer
    of that cable says, in the catalog, that
    X=5R. The voltage at the load is 115V.
    The power supplied by the source is measured
    as 3kW. What are the active and reactive power
    at the load? What percentage of the active
    power delivered by the source is lost as
    feeder heat losses?

    This is what I have done so far


    Is is parallel to Vr ; angle btwn Vr and Vx = 90 degrees
    VL indicates V load, Vs = V source, Vr = V resistor, Vx = V inductor

    The prof gave us a hint saying that "nothing stops you from extending the lines"
    but I stilll cant get all the angles and lengths.

    Someone please help. I really need to know how to solve this question.
    Last edited: Nov 8, 2007
  2. jcsd
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