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Simple KVL node voltage

  1. Feb 3, 2013 #1
    1. The problem statement, all variables and given/known data

    ERcOJxY.jpg

    2. Relevant equations

    ƩCurrent(in) = ƩCurrent(out)

    3. The attempt at a solution
    KttP3fE.jpg





    ----In situations like that, my book takes the node to be a positive voltage when the voltage source is connected like above. For some reason my professor takes it to be negative, is this why my answer is different?


    (sorry for the big pictures)
     
    Last edited: Feb 3, 2013
  2. jcsd
  3. Feb 3, 2013 #2

    gneill

    User Avatar

    Staff: Mentor

    The potential at node a with respect to the reference node depends entirely upon the polarity of the 4V source. The picture is a bit fuzzy around that source, but it appears that the "+/-" indicator shows "+" at the top. That would make node a +4V. It would also make the indicated answers incorrect.

    If the 4V source polarity were reversed, then node a would be at potential -4V with respect to ground, and the given answers would then look good.
     
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