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Math Help - Mesh and Nodal Analysis

  1. #1
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    Jan 2010
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    North East - England
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    Exclamation Mesh and Nodal Analysis

    Hi All,

    This is my first post on this forum and i hope that someone can help me out. I am currently doing a HNC Manufacturing Engineering course at college, and i am having a little trouble getting the correct answer using mesh analysis on the following circuit.



    This is what i have done so far

    10 = 6I1 - 4I2
    0 = -4I1 + 4+j3I2

    D =
    | 6 -4 | = (6*(4+j3))-(-4*-4)
    | -4 4+j3 | = 6+j18

    D1 =
    | 10 -4 | = (10*(4+j3))-(-4*0)
    | 0 4+j3 | = 40+j30

    D2 =
    | 6 10 | = (6*0)-(10*4)
    | -4 0 | = 40

    I1 =
    D1 = 40+j30 = (40+j30)*(6-j18)
    D 6+j18 (6+j18)*(6-j18)

    I1 =
    240+j180-j900-j^2 180
    6^2 + 18^2

    I1 =
    (240+180) -J(-720-180)
    360

    I1 =
    420-j900
    360

    I1 =
    Pol(1.16-j1.5)

    I1 =
    2.76 /-65'

    Now i have spent 4 hours trying this question today and as far as im aware its supposed to be easy (according to the handouts provided from college). I havent done I2 yet as the answer to I1 does not corrospond to the answer on the sheet.

    They give us the answer and we need to get the same answer after completing the theory, its good for this reason :-)

    I hope someone can help me as i am seriously stuck :-) im going to try the nodal analysis question now and i hope to have better luck.

    Thanks all :-)
    Jay
    Last edited by Arkious; January 24th 2010 at 09:02 AM.
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