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Question on voltage in a Thevenin equivalent circuit

  1. Jan 30, 2014 #1
    thevneogo.png

    I am trying to refresh my basic electricity knowledge so the questions might be a little stupid lol.

    1) Am I correct in saying that the voltage, V1, across the 6 ohm resistor is equal to the VOC?

    2) Why isn't the voltage across the voltage source, V2, equal to V1 and VOC? I thought that the voltages in a parallel circuit are equal?


    Cheers!
     
  2. jcsd
  3. Jan 30, 2014 #2

    gneill

    User Avatar

    Staff: Mentor

    Yes. There's no potential drop across the 5 Ω resistor when terminals a-b are open as shown.

    They are not in parallel. There are components in between their respective leads. In particular, the 3 Ω resistor and the controlled voltage source separate the 10 V supply and the 6 Ω resistor's upper leads.
     
  4. Feb 4, 2014 #3
    So if there are components between the wire connecting two elements, the two elements are not in parallel?

    Thanks
     
  5. Feb 4, 2014 #4

    gneill

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    Staff: Mentor

    Correct. For two components to be in parallel they must share two nodes.
     
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