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Homework Help: Need help with solving currents using mesh analysis

  1. Sep 5, 2014 #1
    1. The problem statement, all variables and given/known data

    i cant write the problem text as it is a circuit

    2. Relevant equations

    I labelled the meshes as clockwise shown on the image
    KVL: The sum of voltages around a loop equals zero

    3. The attempt at a solution

    i1 = 8A

    i2: 19(i1 - i2) - 5.54(i2-i3) = 0

    i3 = 1.7A (I created a supermesh around the 1.7A current source - inside the BLUE square)
    Supermesh equation => i3 - i4 = 1.7A

    i4 = 0

    i5: (I used KVL around the outside of the blue square)
    5.54(i2 - i3) -0.5i3 - 0.29(i4 - i5) -12.6(i4 - i5) - 0.5i3

    Can some verify these equations and check they are correct?
  2. jcsd
  3. Sep 6, 2014 #2


    User Avatar

    Staff: Mentor

    But you can at least state what circuit values are required, right? Is it just the mesh currents? Some particular voltage drops? Maybe the power consumed by certain components? Don't leave us guessing!

    Okay so far...

    Your supermesh constraint equation is good but your "conclusion" that i3 = 1.7A is unfounded. How did you conclude that i3 = 1.7A and that i4 = 0?

    No, that doesn't look right; it's not even an equation (no "=" sign). Check what current is actually flowing through the 500m resistors; Looks like i4 to me. Also, what happened to the voltage source in the the supermesh loop? Also, you need to write a separate equation for the i5 loop; Two voltages sources there!
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