Kirchhof's Current Law

Total of all the currents entering in the node is equivalent to total of currents leaving the node. It may also be described as 

                       Sum of entering currents + sum of leaving currents =0

Assumptions

Total leaving currents are taken as positive.

Total entering currents are taken as negative.

Node

      This is the junction of two or more than two elements    

                                  OR

      This is just a point of connection among circuit elements.

Branch

      This is the link or distance among two nodes.

Loop

For the flow of current this is the closed path in which no any node is encountered more than once. Consider some of examples of node analysis or Kirchhof's current law.

Formula for Writing Equation

In node analysis, number of equations is one minus than the number of net nodes.

            Number of equations = N - 1

                                                Where N = number of nodes.

Ground

It is a common or reference point between all of nodes without insertion of any component among.