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Homework Help: Ac circuits

  1. Dec 4, 2008 #1
    1. The problem statement, all variables and given/known data
    Connecting a 250 ohm resistor, 1.2 mH inductor, and 1.8 micro F capacitor in series across a 120 V, 60 Hz peak source, what will the voltage be for the resistor????

    2. Relevant equations

    1) I_peak = V_app peak / Z
    2) V_R = I_peak * R


    3. The attempt at a solution
    I used equation 1) to get I_peak, and then equation 2) to get V_R which I calculated at 20.1 V. The answer's 14 V and I don't understand how the book is getting this
    Last edited: Dec 4, 2008
  2. jcsd
  3. Dec 4, 2008 #2


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    Homework Helper

    Hi jaejoon89,

    Were they asking for the peak voltage or the rms voltage across the resistor?
  4. Dec 4, 2008 #3
    Ah ha! I get it now, they want the rms since it's being read by a voltage meter. Thanks!
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