Impedance

Discussion in 'Homework Help' started by Hello, Mar 22, 2009.

  1. Hello

    Thread Starter Active Member

    Dec 18, 2008
    82
    0
    Can you please have a look at Q3 part (iii) in the attached file.
    When asked to calculate the current, do i use Phasor solution or Eulers notation. I have used both methods but got different answers!

    Phasor solution:
    Impedance Z = (R^2 + XL^2 + Xc^2)^0.5
    So: I = V/Z = 150/116.45 = 1.29A

    Eulers notation:
    Z = 25 + j94.25 - j63.66 = 25 + j30.59
    So: I = 150/(25 + j30.59) = (3750 - j4588.5)/1560.75 = 3.80A


    Any help is greatly appreciated.
     
  2. wr8y

    Active Member

    Sep 16, 2008
    232
    1
    I got 3.7974 amps at 50.73 degrees current lagging.

    Looks like same as you.

    This is wrong:
    Impedance Z = (R^2 + XL^2 + Xc^2)^0.5

    try THIS:
    Impedance Z = (R^2 + (XL- Xc)^2)^0.5

    and do it again! ;)

    Gotta run...
     
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