All about Kirchhoff's current law (KCL)

At a junction, the algebraic sum of current is zero. i.e the algebraic sum of incoming and outgoing current is zero.

in this figure current I1, I2, and I4 is the outgoing current I3, and I5 is the incoming current. So according to KCL...

   

 For Example: Find current I3 ?

Form above equation

I3 = (3+2+2-6)A

    =  1A