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Kirchhoff's Loop Rule

Written by the Fiveable Content Team โ€ข Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examโ€ขWritten by the Fiveable Content Team โ€ข Last updated September 2025

Definition

Kirchhoff's Loop Rule, also known as Kirchhoff's Voltage Law (KVL), states that the sum of the voltage drops around any closed loop in a circuit is equal to the sum of the voltage sources in that loop.

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Kirchhoff's Loop Rule Definition - AP Physics 2 Key Term | Fiveable