How to calculate average power, ac superimposed on dc voltage.

Discussion in 'The Projects Forum' started by AbhimanyuSingh, Jun 11, 2011.

  1. AbhimanyuSingh

    Thread Starter New Member

    May 22, 2011
    24
    0
    What should be the best way to way to calculate the average power across a resistive load for the voltage form shown in the image attached?
     
  2. #12

    Expert

    Nov 30, 2010
    16,284
    6,797
    Imagine a horizontal line through the center of the sine wave and call that voltage.
    The, P = E squared over R
     
  3. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
    141
    First digitize it. If you want the average, then use the definition of the average: just sum up the points and divide by the number of points.

    Instead, you might want to consider the RMS value instead: square all the values, average them, then take the square root.

    Then it's the usual V^2/R calculation.
     
  4. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,387
    1,605
    Your spice program can't do power?

    I'd just ignore the AC component until I had a real breadboard to measure what the signal really looks like.
     
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