DC Network Theorems Unit 2 – Kirchhoff's Current Law
Kirchhoff's current law deals with currents at circuit points called nodes. A node is a junction, or
a circuit point, where components are joined. Current enters and exits each node.
Kirchhoff's current law deals with the relationship of circuit currents and circuit nodes.
Circuit current flows into and out of each node of a two-branch circuit. IT flows into NODE 1.
Two currents (I 1 and I 2 ) leave NODE 1. Therefore, IT equals I 1 + I 2. I 1 and I 2 combine at
NODE 2. The combination of I 1 and I 2 results in IT at NODE 2. Therefore, IT from the power
source is the same as IT to the power source.