Question

State Kirchoff's current law and also give the sign convention for current.

Answer 1

Kirchhoff's current law states that at any node(junction) in an electric circuit, the sum currents flowing in to that node is equal to the sum of current flowing out of that node.

Sign convention:- current entering at any junction is considered as positive.

and current leaving the junction is considered as negative.

In given circuit,

By Kirchhoff's current law,

$i_2+i_3=i_1+i_4$