According to Kirchhoff's current law, what can be said about the currents at a junction?

According to Kirchhoff's current law (KCL), the sum of currents entering a junction must equal the sum of currents leaving that junction. This principle is based on the conservation of electric charge, which states that charge cannot accumulate at the junction; whatever charge flows in must flow out.

In practical terms, if you have a junction where several wires meet, the currents flowing into that junction from the wires must balance with the currents flowing out to other branches. For example, if 5 amperes are flowing into a junction and 5 amperes are flowing out, that satisfies KCL. If there were to be any imbalance, it would imply that charge is accumulating or depleting at that point, which cannot happen in a steady-state electrical circuit.

This understanding is critical when analyzing complex circuit configurations, enabling you to solve for unknown currents or verify circuit behavior.