A circuit node is a set of electrically connected points treated as having a common electric potential in a lumped-element model. Ideal connecting wires belong to the same circuit node even if the drawing places them far apart.
Conservation of electric charge leads to Kirchhoff's current law: the algebraic sum of currents entering an ideal node is zero when unmodelled charge accumulation is negligible. For example, a current entering a junction equals the sum of two outgoing branch currents. A capacitor connected at that node does not invalidate the law: its charging current must be included as another branch current.
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