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Constraint on Thevenin impedance

  1. Jul 12, 2011 #1
    Let's say we have a circuit composed of simple linear circuit elements (resistors, inductors and capacitors). Now we calculate the Thevenin equivalent circuit for some load within this circuit, and we determine the Thevenin impedance, Z_t.

    My question is this: Is it generally the case that the real part of Z_t is positive (Re Z_t greater than or equal to zero)? In particular, has this been proven to be generally the case?

    Thanks for any help, Patrick
     
  2. jcsd
  3. Jul 15, 2011 #2
    Last edited by a moderator: Apr 26, 2017
  4. Jul 15, 2011 #3

    uart

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    Hi Patrick. The simple answer is that for linear circuits containing only independent sources then yes the real part of the Thevenin impedance is non-negative. However for circuits containing dependent sources the Thevenin resistance may be negative.
     
    Last edited: Jul 15, 2011
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