Thevenin Equivalent in AC circuit

Discussion in 'Homework Help' started by jboavida, Nov 19, 2008.

  1. jboavida

    Thread Starter Member

    Jul 10, 2008
    23
    0
    Hi All,

    My name is Joaquim and I'm new in this forums. I am a Electronic Engineer student (1st Year).

    I have a question about a Thevenin equivalent circuit in AC.

    I need someone to tell me if I'm doing the right math in finding the thevenin equivalent (AB point):

    Please see the attached circuit.


    I need to calculate the inductor reactance
    (Xl) = 2 * Pi * F * L
    The capacitor reactance
    (Xc) = 1 / ( 2 * Pi * F * C )

    And then I add R1 to L1 reactance and parallel with C1 reactance.
    Finally, the result added to R2.

    ((R1+XL1) // XC1)+R2 = ZThevenin

    Are my calculations correct or I'm missing something?

    Thanks in advance

    Joaquim
     
    Last edited: Nov 19, 2008
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Where is the circuit?
     
  3. jboavida

    Thread Starter Member

    Jul 10, 2008
    23
    0
    Attached now. Bad url. Sorry & Thanks

    Joaquim
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    You are right.
     
  5. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Looks right to me also.

    For the sake of completeness, I imagine that your instructor intended for you to complete the calculation. Then you would be able to use the given frequency of the AC voltage source to compute the actual value of Zth.

    hgmjr
     
    Last edited: Nov 20, 2008
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