This presentation summarizes Kirchhoff's voltage law (KVL). KVL states that the sum of the voltages around any closed loop in a circuit must be equal to zero. It is one of Kirchhoff's circuit laws derived by Gustav Kirchhoff. KVL can be expressed as the algebraic sum of all the voltage rises and drops around a closed loop equalling zero. An example circuit is provided and KVL is applied to solve for the currents and voltages.