**Kirchoff’s current law** states that the algebraic sum of the currents meeting at any junction in a circuit is zero.

The convention is that, the current flowing towards a junction is positive and the current flowing away from the junction is negative. Let 1,2,3,4 and 5 be the conductors meeting at a junction O in an electrical circuit (Figure).

**Fig: Kirchoff’s current law**

Let I_{1}, I_{2}, I_{3}, I_{4} and I_{5} be the currents passing through the conductors respectively. According to Kirchoff’s first law.

I_{1} + (−I_{2}) + (−I_{3}) + I_{4} + I_{5} = 0 or I_{1} + I_{4} + I_{5} = I_{2} + I_{3}.

The sum of the currents entering the junction is equal to the sum of the currents leaving the junction. This law is a consequence of conservation of charges.