help needed for mesh equations

Discussion in 'Homework Help' started by hunterage2000, Mar 17, 2011.

  1. hunterage2000

    Thread Starter Active Member

    May 2, 2010
    400
    0
    Can someone please tell me the mesh equations for the attached jpeg, I am new to this and cant get my head around it.
     
  2. Robert.Adams

    Active Member

    Feb 16, 2010
    112
    5
    Start by drawing loops around the three enclosed square regions. Lable these loops i1, i2, & i3. (I started my labelling at the top then bottom left and then bottom right but it really doesn't matter).

    As you trace away around the loops note the voltages dropped.

    For example for the top-loop (i1), you get
    R3*i1 + R4(i1-i3) + R2(i1-i2) = 0

    (i2/i3 go against i1 and are subtracted in my loops since I have them all going CW)

    Try the rest on your own and I'd be happy to review them.
     
  3. hunterage2000

    Thread Starter Active Member

    May 2, 2010
    400
    0
    Would the others be:

    i2 = 107 + R1i2 - R2(i1-i2)

    i3 = -107 - R4(i1-i3) + R5i3
     
  4. Robert.Adams

    Active Member

    Feb 16, 2010
    112
    5
    Those look correct, except the Left Hand Sides of your equation should be set equal to zero instead of i2/i3.
     
  5. hunterage2000

    Thread Starter Active Member

    May 2, 2010
    400
    0
    so to solve mesh equations you:

    assign loop direction in each mesh
    assign voltage source in same direction as loop
    assign voltage drops opposite to direction of loop
    find equations of each mesh
     
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