loop equation

Discussion in 'Homework Help' started by fran1942, May 14, 2011.

  1. fran1942

    Thread Starter Member

    Jul 26, 2010
    58
    0
    Hello, I am unsure if I have these loop equations correct. I am trying to solve the currents for the two loops ie. I1 and I2.
    I think I am wrong because dont I need a crossover variable to link the two loop equations or does the shared voltage source in the middle do that ?
    Anyway, I have come up with:

    13 - 8 - 5I1 = 0
    -16 - 8 - 8I2 = 0

    simplified to:

    5 - 5I1 = 0
    -24 - 8I2 = 0

    I1 = -5/-5 = 1Amp
    I2 = 24/-8 = -3Amps

    Could someone please tell me where I have gone wrong if I have.
    Thanks kindly for any help.
     
    Last edited: May 14, 2011
  2. jegues

    Well-Known Member

    Sep 13, 2010
    735
    43
    I1 looks correct,

    In your second mesh equation,

    -24 + 8I2 = 0, I2=3A, you're off by a negative sign.
     
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