More AC Analysis Questions

Discussion in 'Homework Help' started by Digit0001, Apr 21, 2011.

  1. Digit0001

    Thread Starter Member

    Mar 28, 2010
    89
    0
    Hi

    The following two questions i don't know how i would complete it:

    View attachment tut5qns2.doc

    I am having problem solving question 8 part c) and question 9
    P.S
     
    Last edited: Apr 21, 2011
  2. justtrying

    Active Member

    Mar 9, 2011
    329
    339
    for 8c, see if you remember how to calculate the phase angle if you have an equation for total impedance. In the problem, you are given the angle and L, so you can solve for R.

    problem number 9 is a bit more complicated, you need to write out two equations - one for V1 and another for V0 - using the information given. Then you can solve for R and L
     
  3. Digit0001

    Thread Starter Member

    Mar 28, 2010
    89
    0
    Would i use this question to find the R?

    Z^2=\sqrt(R^2+(X_L)^2)
     
  4. justtrying

    Active Member

    Mar 9, 2011
    329
    339
    well, you don't know Z, but you can use the angle formula: your formula gives you the magnitude, how would you express the angle? R runs along x-axis in polar and Xl is y, so to find the angle, you can use tangent function
    [​IMG][​IMG][​IMG]
     
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