Question

Definition of Kirchhoff's first law​

Answer 1

Kirchhoff's current law (1st Law) states that the sum of all currents entering into a node (or a junction) is equal to the sum of all currents leaving the node. This is a consequence of charge conservation.

Explanation:

• In figure, A is a node(or junction) formed by three conductors. The currents in these conductors are$I_{1} , I_{2} , I_{3}.$

• Some of these currents are flowing towards A and some other currents flowing away from it.

• According to Kirchhoff's Current Law,

                         $I_{1} + I_{2} = I_{3}$

       (entering towards A) = (leaving from A)

• The current at node A is equal to zero.

• Mathematically, Kirchhoff’s Current law,

                ∑$\left \ {{n} \atop {k=1}} \right. I_{k} =0$

• where n is the total number of branches carrying current towards or leaving from the junction.