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Homework Help: Maximal power question

  1. Jan 23, 2010 #1
    1zo88kx.jpg
    find the R so we will have maximal power on it

    so now i need to use this formula
    [tex]P_{max}=\frac{1}{8}\frac{|\tilde{V_s}|^2}{R_s}[/tex]
    [tex]|\tilde{V_s}|^2=480^2+1440^2=2304000[/tex]
    R_s is the real part of the impedance (80)

    [tex]P_{max}=\frac{1}{8}\frac{2304000}{80}=28800[/tex]

    but here it doesnt resemble at all the maximal power formula
    14mh11x.jpg

    they are counting the average power and saying something about rms
    ??
     
    Last edited: Jan 23, 2010
  2. jcsd
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