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

[bibo_dvd]

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

In This Question "Nodal Analysis" we will apply kirchhoffs 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 :

Thanks Guys !

 

[UltrafastPED]

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.