Which law states that the current entering a junction equals the current leaving?

The correct answer is Kirchhoff's Current Law, which states that the total current entering a junction in an electrical circuit must equal the total current leaving that junction. This principle is based on the conservation of electric charge, meaning that charge cannot accumulate at a junction; it must flow in and out at equal rates. This law is fundamental in analyzing complex circuits, allowing engineers and technicians to solve for unknown currents at various points within a network of conductors.

Ohm's Law, while important, relates voltage, current, and resistance rather than addressing the behavior of current at junctions. Kirchhoff's Voltage Law focuses on the sum of the electrical potential differences (voltage) around a closed loop, and Faraday's Law describes electromotive force induced in a circuit due to changing magnetic fields, which does not pertain to current behavior at junctions. Understanding Kirchhoff's Current Law is crucial for anyone studying electrical theory, as it serves as a basis for circuit analysis and design.