Kirchoff's first law, i.e. $\sum _{ }^{ }i=0$ at a junction, deals with the conservation of

We know from the Kirchhoff's first law that the algebraic sum of the current meeting at any junction in the circuit is zero (i.e.$\mathrm{\Sigma }i=0$) or the total charge remains constant. Therefore, Kirchhoff's first law at a junction deals with the conservation of charge.