Kirchhoff's Voltage Law: The Sum of Voltages in a Closed Loop is Zero

Kirchhoff's Voltage Law (KVL) states that the sum of the voltages around any closed loop in a circuit is equal to zero. In other words, the sum of the electromotive forces (EMFs) is equal to the sum of the potential differences.

This law is a direct consequence of the conservation of energy. As a charge moves around a closed loop, it gains energy from the EMFs and loses energy due to the potential differences across the circuit elements. The total energy gained must equal the total energy lost, ensuring that the net energy change is zero.

KVL is a powerful tool for analyzing circuits. It can be used to solve for unknown voltages, currents, and resistances. It is also a fundamental principle in the design and analysis of electronic circuits.