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Homework Help: Complex power question

  1. Feb 14, 2015 #1
    1. The problem statement, all variables and given/known data
    Screen Shot 2015-02-14 at 5.16.52 PM.png

    [moderator note: Image inserted to be visible in problem statement]
    2. Relevant equations

    3. The attempt at a solution
    My friend and I are trying to figure out how this works. This is the questions and the solution manual. We understand where the real power comes from but not at all how to get the complex. If anyone could give a brief explanation, that would be great. Preferably A because thats where we started and just cannot get the complex part at all.
    Last edited by a moderator: Feb 14, 2015
  2. jcsd
  3. Feb 14, 2015 #2


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    Staff: Mentor

    Active, reactive, and apparent power. It's well explained on Wikipedia.

    They form a right-angle triangle: active or real power on the base, reactive power on the altitude, and complex power forms the hypotenuse. One of the angles is the power factor angle such that P = S.cos Φ
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