Need helping studying for a test

Discussion in 'Homework Help' started by Beelze, Mar 20, 2012.

  1. Beelze

    Thread Starter New Member

    Mar 20, 2012
    2
    0
    I am studying for a test that will be given next week. This is one of the problems that I will encounter. How do I find the capacitance of C1 with these given values? [​IMG]
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Have a look at this material on series RC circuits in the AAC ebook.

    hgmjr
     
  3. qtlj657

    New Member

    Mar 18, 2012
    7
    0
    calc the current through R1=42v/100Ω=420mA. that's the total current of the circuit.
    The total impedance= V total/I total =120V/420mA=285.71Ω
    for (Total impedance)^2=(R1)^2+(Xc1)^2. 285.71Ω^2=100Ω^2+ (Xc1)^2. the impedance of C1=267.6 Ω

    for the formula X=1/(2∏fC). 267.6Ω=1/(2*∏*60Hz*C), can know C=9.91μF
     
  4. Beelze

    Thread Starter New Member

    Mar 20, 2012
    2
    0
    Thanks, that's more than enough. I had really just needed the formulas.
     
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