True, Reactive, and Apparent power problem

Discussion in 'Homework Help' started by metelskiy, Feb 19, 2011.

  1. metelskiy

    Thread Starter Member

    Oct 22, 2010
    66
    3
    I just read in e-book all about those three powers and seems like I understood the subject well but than this next problem gives me trouble:
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    first they ask to find average, reactive and apparent powers for 20Ω and i'm not sure how to do that. Assuming average they mean true power, Would i have to start with P_{real}=\frac {(60v<30)^2} {20ohms<0} ?
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    A pure resistance draws no reactive power. The real (average) and apparent power magnitudes for the 20Ω will therefore be the same.

    In the case of a purely reactive element (say the 10Ω [reactance] inductor) no real power is drawn - only reactive power. For a purely reactive element the apparent and reactive power magnitudes will also be the same.
     
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