*[[Kirchoff's 2nd Law]] helps in setting up equations to solve for unknown [[Potential Difference|voltage]]s and [[Electrical Current|currents]] in circuit analysis.
*[[Kirchoff's 2nd Law]] is applicable to both [[Direct Current|DC]] and [[Alternating Current|AC]] circuits.
Used *[[Kirchoff's 2nd Law]] can be used in combination with [[Kirchoff's 1st Law|Kirchhoff's first law]] for comprehensive circuit analysis. ===Formula=== *<math>\sum V_n=V_1 + V_2 + V_3 +...=0</math> *<math>\sum \varepsilon=\sum V_{pd}</math> Where: *<math>\sum V_n</math> represents the sum of all [[Potential Difference|voltages]] in a loop (including [[Electromotive Force|emfs]] and [[Potential Difference|pds]]), *<math>V_1 + V_2 + V_3 +...</math> represents the individual [[Electromotive Force|emfs]] and [[Potential Difference|pds]] of each component in a loop, *<math>\sum \varepsilon</math> represents the sum of all [[Electromotive Force|emfs]] in a loop, *<math>\sum V_{pd}</math> represents the sum of all [[Potential Difference|potential differences]] across components in a loop
===Examples===
*In a [[Series Circuit|series circuit]], the sum of the [[Potential Difference|voltage]]s across each component equals the total [[Potential Difference|voltage]] supplied by the [[Electrical Battery|battery]].*Applied to find the [[Potential Difference|potential differences ]] and [[Electromotive Force|emfs ]] in [[Electrical Circuit|electrical circuits]].