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Thevenin Equivalent issue - I think I'm missing something

  1. May 6, 2013 #1
    1. The problem statement, all variables and given/known data

    Given the circuit (Attached in image) Find the thevenin equivalent circuit.

    I know its a fairly simple thing, But I am not understanding where the lecturer is getting this answer from, unfortunately his solutions just state the voltage so I feel like I must be missing something important.



    2. Relevant equations
    Vth= (R1/Rtotal)xVtotal


    3. The attempt at a solution

    I tried finding the voltage dropped over the 10Ω + 5Ω resistors, which I found to be 4.3v

    Vth= (R1/Rtotal)xVtotal = 4.3v
    Where R1 = 10Ω+5Ω
    Rtotal=35Ω

    But the lecturers solutions simply say Vth=2v

    Any help is appreciated
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. May 7, 2013 #2

    SammyS

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    attachment.php?attachmentid=58536&d=1367869258.jpg

    What's the voltage across the output if there's no load? I.e., there is no current drop across the 10 kΩ resistor. You have a simple voltage divider with 20kΩ and 5kΩ .
     
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