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Mean value and rms value

  1. Feb 10, 2009 #1
    1. The problem statement, all variables and given/known data

    comment on nature and meaning of results in terms of analysis of dynamic signals.
    (why do i see these results and what should we do to increase the accuracy of these two values)


    2. Relevant equations

    y=30+(2cos(6*pi*t))

    both mean value and rms value come out to be very close to 30ish. (29~31)

    3. The attempt at a solution

    i really have no idea...rounding errors?
     
  2. jcsd
  3. Feb 10, 2009 #2

    Delphi51

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    Homework Helper

    mean and rms values have to do with signals that vary with time.
    They are different ways to average the signal over time.
    They normally give quite different answers. For example, the 120 V on a home plugin would is 120 V RMS but has a mean of zero volts.
    If you look up the term "root mean square" in your text book and/or internet, you should find some examples to build up your experience to the point where you can say something about a signal that has a mean of 29 and and rms of 31.
     
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