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Homework Help: Check nodal analysis work?

  1. Oct 1, 2011 #1
    1. The problem statement, all variables and given/known data

    uKyms.png

    2. Relevant equations

    nodal analysis

    3. The attempt at a solution

    When i did the problem, i got 3V. Is this right or wrong?
     
  2. jcsd
  3. Oct 1, 2011 #2

    gneill

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    Staff: Mentor

    It is incorrect.

    Show your work if you want help.
     
  4. Oct 1, 2011 #3
    TIy8n.jpg
     
  5. Oct 1, 2011 #4

    gneill

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    Staff: Mentor

    Your formula (1) doesn't seem to match the circuit diagram. Shouldn't V2 = V1 + 18V?
     
  6. Oct 1, 2011 #5
    Ah, you're right. Thanks.

    If that's corrected and propagated down... I get

    V2 = 4.5V, V1 = -13.5V, V3 = 11.25V

    So the answer is 11.25V?
     
  7. Oct 1, 2011 #6

    gneill

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    Staff: Mentor

    Looks much better! That's it!
     
  8. Oct 1, 2011 #7
    Thanks! I really appreciate it.
     
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