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.