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Electric Circuit Analysis: How to find the sign for power?

  1. Jan 8, 2013 #1
    My textbook does a very poor job of explaining how to assign signs to power: http://www.mediafire.com/view/?e0xr8j41tokujx6

    It goes on to explain passive sign convention but it never explains active sign convention. Also, shouldn't the sign for power depend on voltage and current since power is just voltage times current? Why does it essentially tell me to memorize the signs depending on the direction of the current? Surely there is a more intuitive approach?
  2. jcsd
  3. Jan 8, 2013 #2
    Read Valkenburg instead of Boylested.
  4. Jan 8, 2013 #3
    I have no idea to what you're referring to.
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