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Homework Help: Find each current with using Mesh Current Method

  1. Dec 31, 2011 #1
    given Electric circuit, i asked to find each current (I1 I2 I3 I4) by using Mesh Current Method.

    so how you can see in the picture i marked the directions for the 4 currents in blue color.

    and i wrote the equations in red color.
    what i am not sure is if the equations for I3 and I4 is correct.
    so i need help here.


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  2. jcsd
  3. Jan 1, 2012 #2


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    Staff: Mentor

    The constant current supply in the branch shared by meshes 3 and 4 needs to be handled appropriately. In your equations you've treated it as a zero Ohm resistor, which is not correct.

    What you can do is assign it an unknown potential drop (maybe call it Vx), and since it fixes the current in its branch it introduces a new equation that specifies the relationship between the mesh currents I3 and I4, namely: I4 - I3 = 2A.
  4. Jan 2, 2012 #3
    ok i will try it.

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