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Resistors in parallel Thevenin circuit

  1. May 30, 2014 #1
    ba.png


    When calculating Rth, they took the parallel combo of he 40 kilo ohm and 160 kilo ohm resistors, then they added the 8 kilo ohm resistor that's in series with the combo.

    Maybe I'm having a brain freeze or something but how are the 40 kilo ohm and 160 kilo ohm resistors in parallel? They don't have the same voltage across them?
     
  2. jcsd
  3. May 30, 2014 #2

    phinds

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    Gold Member
    2016 Award

    When finding a Th equivalent circuit, voltage sources are treated as a short circuit when figuring Rth
     
  4. May 31, 2014 #3

    NascentOxygen

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    Staff: Mentor

    The answer arrived at by this method should be the same as you'd calculate using the open-circuit voltage / short-circuit current approach. This means you can always check your own answer. :smile:
     
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