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Homework Help: Thevenin Circuit Help

  1. Oct 29, 2006 #1
    Hey,

    For the attached question, the only part I do not understand is why the Thevenin Resistance is equal to R3.

    I thought it would be (R1 || R2) + R3

    Can somebody please explain this?

    cheers!
     

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  3. Oct 30, 2006 #2
    lol i also think wat u think(dont count on that though my ckts suck)...do tell me too why it isnt:d
     
  4. Oct 30, 2006 #3

    SGT

    User Avatar

    The second hand drawn figure shows it. R1 and R2 are not in parallel. They are in series and their series connection is in parallel with a short circuit, so the equivalent resistance of this connection is zero.
     
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