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Homework Help: Kirchoff's Rules

  1. May 16, 2007 #1


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    1. The problem statement, all variables and given/known data
    This is the circuit I'm working on: cir.gif

    2. Relevant equations
    My equations are:

    3. The attempt at a solution
    I should have a third unknown in each equation. I not seeing where I'm going wrong. I'm supposed to put this in a 3X3 matrix and have Excel solve for the simultaneous equations. Any help?
  2. jcsd
  3. May 16, 2007 #2


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    There are three different loops that you can sum the voltages around in the problem. The one involving R2 and R3 does not include the battery. So the sum around that loop should be zero. Your first equation also has an 800I3. Typo?
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