**Kirchoff's voltage law** (**KVL**) states that that the change in potential difference (in other words, the *voltage drops*) in any closed electrical circuit must sum to 0.^{[1]} A voltage drop is the change in voltage over any element in a circuit.

KVL follows from the definition of electric potential and conservation of energy.^{[1]}

- See also: Kirchoff's current law

## References

- ↑
^{1.0}^{1.1}Schwarz, Stephen E. and William G. Oldham.*Electrical Engineering: An Introduction, 2e.*Oxford University Press: 1993.