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Nodal Analysis , Can't Understand the direction of a current

  1. Oct 28, 2013 #1
    Nodal Analysis , Can't Understand the direction of a current !!

    In This Question "Nodal Analysis" we will apply kirchoff's current law ..

    My Question is :

    Why in Fig 8.51 and 8.52 the currents take these directions ??

    i tried to get it but i couldn't

    Photos :
    EsMgoyM.png
    8tXTNzB.png
    AiDuFsh.png
    4WRBazT.png

    Thanks Guys !! :))
     
  2. jcsd
  3. Oct 28, 2013 #2

    UltrafastPED

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    Science Advisor
    Gold Member

    It doesn't matter which way you draw the arrows; it is arbitrary. If you picked the "correct" direction that current will be positive when you solve the system, but if you picked wrong it will be negative.

    So in the end you will know the actual currents and their directions.
     
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