Quick Mesh Analysis Question

Discussion in 'Homework Help' started by yan500, Jul 23, 2011.

  1. yan500

    Thread Starter Member

    Jul 12, 2011
    Hey all, I'm trying to apply the Mesh Current theory to Question 19 on this worksheet: http://www.allaboutcircuits.com/worksheets/dc_sp.html

    I keep getting these equations:

    24 - 1500Ia - 2200(Ia+Ib) = 0

    -2200(Ia + Ib) + 5000Ib = 0

    This second equation throws me for a "loop" (haha get it?). I keep getting a HUGE current which can't possibly be right. So what am I doing wrong?

    Edit: I solved this problem using the easy way (combining the resistances and getting a total current and then splitting the resistors one by one) and got the right answer but I see this as a nice way to practice Mesh Current theory.
  2. blah2222

    Well-Known Member

    May 3, 2010
    Have to keep your passive sign convention consistent.
  3. yan500

    Thread Starter Member

    Jul 12, 2011
    Hmm...so the second equation is numerically correct?

    Edit: I also solved the problem and got the right answer using the Branch method.
    Last edited: Jul 23, 2011