Kirchhoff's Current Law (KCL):
Kirchhoff's current law states that algebraic sum of all the current meeting at a point or junction is zero. As this law relates the current passing through the circuit, this is known as Kirchhoff's Current Law (KCL).
In Figure , applying KCL to the junction, we have
I1 + I3 + I4 - I2 - I5 = 0
Figure: KCL at Junction
∑ Current entering the junction = ∑ Current leaving the junction.
KCL also mention the law of conservation of charges and may also be states as at any node of a circuit, at every instant of time, the sum of incoming currents is equal to the sum of outgoing currents.