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How to calculate the energy and power of a signal?

  1. Jul 20, 2016 #1
    I would like to improve my knowledge of signals. I just came across this topic while reading a book. So I would like to know how to find out that the given signal is power signal or energy signal. For example please solve the following and give your explanation in reference to that.
  2. jcsd
  3. Jul 20, 2016 #2


    Staff: Mentor

    I don't know what power signal or energy signal mean.

    Power is voltage times current, P=V*I. You calculate that instantaneously. You can also calculate an average over any period you wish. Energy is the time integral of power. Those statements apply to all signals.

    e^j(2t+π/4) is merely a sin wave. It tells you nothing about V or I or P or energy.
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