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Thevenin Equivalent & Available Power???

  1. Sep 10, 2016 #1
    1. The problem statement, all variables and given/known data
    Screen Shot 2016-09-10 at 3.19.22 PM.png

    2. Relevant equations
    Node Voltage

    3. The attempt at a solution
    So I set up my equations in the picture below, but I'm kinda confused about the Vx's in the equations. First, did I set these up correctly? If so, solving them I get that V2=0 which would mean my Voc is 0V which means Vthev=0. Is that even possible? Am I doing something wrong here?

    New Doc 26.jpg
  2. jcsd
  3. Sep 10, 2016 #2


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    Staff: Mentor

    That rectangle labelled -Vx, what is it?
  4. Sep 10, 2016 #3
    What? That's a dependent current source.
  5. Sep 11, 2016 #4


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    Staff: Mentor

    A Thévenin voltage of zero is okay. This still leaves you trying to determine Rth. There is not much use pretending to short-circuit the output to measure current—because regardless of the Thévenin resistance, that current is going to be zero because its voltage source is zero.

    An equally-valid approach is to inject current into your circuit's outputand measure/calculate the voltage this causes at the output. You can then use this data in conjunction with the Thévenin model to calculate Rth.

    ⏩ So draw an independent current source adding a current Iin at terminal a and determine Vab.

    it's a linear circuit model, so on paper you can do whatever you wish to it
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