Kirchhoff’s Current Law (KCL) — at a junction, do sums of entering and leaving currents match?

Introduction / Context:
Kirchhoff’s Current Law is one of the two foundational network laws used in circuit analysis. It enforces charge conservation at a node (junction) and underpins nodal analysis, Thevenin/Norton conversions, and network simulators.

Given Data / Assumptions:

• Ideal lumped circuit model with clearly defined nodes.
• No net charge accumulation at a node in steady state.
• Currents defined as positive into or out of the node with a consistent sign convention.

Concept / Approach:
KCL states that the algebraic sum of currents at a node equals zero, which is equivalent to “sum of currents entering equals sum of currents leaving.” This is a direct consequence of charge conservation: a node cannot store net charge over time in the lumped-parameter assumption, hence what flows in must flow out.

Step-by-Step Solution:

Verification / Alternative check:
Use nodal analysis on a simple parallel network; solving produces branch currents whose sum equals the source current, confirming KCL at the supply node.

Why Other Options Are Wrong:

• “False” would contradict charge conservation and invalidate standard analytical methods.

Common Pitfalls:
Inconsistent current directions leading to sign errors; always define arrows and stick to them to avoid apparent “violations” of KCL.

Final Answer:
True