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Homework Help: RLC parallel circuit phasors and current

  1. Mar 6, 2013 #1
    1. The problem statement, all variables and given/known data
    Sorry for the stupid question, but I want to be sure whether everything is correct.
    Here is the problem, I think I managed to do all the parts.

    2. The attempt at a solution
    a)ω=2∏f; ω=4000∏ or 12566.37 rads
    b)Xl = ωL = 4000∏x0.004=50.27Ω
    c)I1=R x Vac
    I2=Xl x Vac
    I3=Xc x Vac
    d) 3rd Image
    e) It is stated that I and Vac are in phase. This can be done only if the two reactances(Xl and Xc ) are equal to each other.
    f) C=1.583 x 10^(-6)
    g) Here I am not sure that I used the right equation. They ask for the amplitude of the current I. Using the phasor diagram I used I=√((I1)^2+(I3-I2)^2) which gives 0.007, which is I1.

    Attached Files:

  2. jcsd
  3. Mar 8, 2013 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Since X_L = X_C what does that say about the impedance of L and C in parallel?
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