setting matrices for circuits

Discussion in 'General Electronics Chat' started by antiantianti, Aug 4, 2016.

  1. antiantianti

    Thread Starter New Member

    Aug 4, 2016
    11
    0
    Hello Everyone
    I almost never get to get the right matrix for a circuit either because i dont choose the right mash or because I dont choose the right current for each resistance or because i made a mistake because of the sign i searched a lot on the internet and cant find help because they maybe assume this is easy thing to figure out this is an example .
    The first mistake that I made I didnt choose the right mashes I chose the mashes and theni didnt choose the right current and got this equations
    Uq1-Ri1I1-R1I1 =0
    R2I1+R2I3+R1I1=0
    Uq2-Ri2I3-R3I3=0
    but the right answer that I found on the book is
    I also have difficulities in finding the right direction and setting the right sign for each tension . Please dont tell me to go again and read the lesson because I did couple a time and I dont get to figure out the right matrix when a cirucit gets more complicated soI guess giving a concrete example will help a little bit
     
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