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Thvenin - Northon

  1. Dec 27, 2011 #1
    Suppose i want to find the Thevinin Voltage equivalent between points a and b,
    but there are dependent sources in my circuit that depend on the current between points a and b, how should i work?

    Thanks!
     
  2. jcsd
  3. Dec 27, 2011 #2

    gneill

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    Staff: Mentor

    Put your own fixed current source, I, at a-b and use the usual analysis methods to find the voltage V that this current source must have across it while connected to the circuit. Thevenin resistance will then be V/I. Since you now know the Thevenin resistance, the output voltage V and current I, you can work out the Thevenin voltage that sits "behind" the Thevenin resistance to produce V.
     
  4. Dec 28, 2011 #3
    I can't quite remember, but this approach only works if the circuit consists of only dependent sources. (i.e. not a mix of independent/dependent)

    Correct?
     
  5. Dec 28, 2011 #4

    gneill

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    Staff: Mentor

    I would think that it would work in all cases (superposition theorem), but I am willing to be corrected. Can you give an example where it would not work?
     
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