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Homework Help: Circuit nodal analysis

  1. Dec 14, 2012 #1
    1. The problem statement, all variables and given/known data

    3. The attempt at a solution
    Essentially I am having trouble with solving for I_sc when I remove the load and replace it with a wire.

    I used a super node at 1 and 4 and also in my diagram I have defined the currents with directional arrows. I have been on this question for a long time and cannot get the correct answer which is I_sc = 8mA. I know it is wrong because I plugged it into wolfram alpha and ended up with the results as seen below.

    From KCL:

    Where V1=a, V2=b, V3=c, I_sc=x and solving it gets:
  2. jcsd
  3. Dec 14, 2012 #2


    User Avatar

    Staff: Mentor

    V2 = 0, because node 2 is shorted to ground.
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