Node law — current conservation: At a junction (node) in an electrical network, is it possible for the total current entering the node to differ from the total current leaving the node under normal steady conditions?

Introduction / Context:
Kirchhoff’s Current Law (KCL) states that the algebraic sum of currents entering and leaving a node is zero. This embodies conservation of charge and is fundamental to circuit analysis across DC and AC regimes for lumped networks.

Given Data / Assumptions:

• Ideal lumped-element circuit model.
• Steady conditions or sinusoidal steady state for AC.
• No charge accumulation at an ideal node.

Concept / Approach:
KCL arises because charge cannot pile up indefinitely at a point in a lumped model; any current arriving must depart. Mathematically, sum(I_in) = sum(I_out). Transient elements like capacitors are handled by defining branch currents consistently; KCL still holds at every instant when displacement currents are included in Maxwell-consistent models.

Step-by-Step Solution:

Verification / Alternative check:
Simulations and nodal analysis rely on KCL; measured discrepancies typically result from instrument error or parasitic storage, not a violation of the law itself within the lumped model assumptions.

Why Other Options Are Wrong:

• Correct: The statement is not correct; KCL forbids a mismatch.
• True only during capacitor charging: KCL still holds when capacitor branch current is included.
• True only at very high frequency: KCL holds; modeling may require displacement current but conservation remains.
• True if the meter accuracy is low: Measurement error does not change physical laws.

Common Pitfalls:
Interpreting meter mismatch as a physical violation; overlooking displacement currents in high-frequency or field-theory contexts and then misapplying the lumped model.

Final Answer:
Incorrect