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I did it by adding a 20 test voltage source and used mesh to get the following 4 equa

  1. Nov 22, 2009 #1
    1. The problem statement, all variables and given/known data

    The question is find R Thevenien using voltage test source across terminals a and b of the following circuit:

    http://img255.imageshack.us/img255/8660/rthevenen.png [Broken]





    2. Relevant equations

    N/A

    3. The attempt at a solution

    I did it by adding a 20 test voltage source and used mesh to get the following 4 equations of the 4 meshes ( I deactivated the 480 V independent source to be able to use test voltage method)

    M1:6(x-t) + 40(x-y)+4x=0
    M2: 40(y-x)+20=0
    M3: 80(z-t) - 20q +2z-20=0
    M4:4t + 8(t-z) +6(t-x)=0
    q=x-t

    I R thevenen to be 11.55 but actually the correct answer is 12 ohms.

    Where is my mistake.
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
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