Electricity & Magnetism
Kirchhoff's Voltage Law
Sum of voltage changes around closed loop is zero.
Variables
ΣVV
Sum of voltages
Around closed loop
In SI units: kg·m²/(A·s³)
Derivation
Conservation of energy in circuit.
Your notes
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Where this formula is listed
- Electricity & Magnetism formulas, under Electric Circuits, alongside Electric Power, Electric Current, Resistance, Resistors in Series and Resistors in Parallel.
- In the electricity & magnetism list it comes after Resistors in Parallel and before Kirchhoff's Current Law.
- Electricity & Magnetism formula sheet, one of 48 formulas printed with symbol keys and SI units.
- The full formula index, grouped by category and topic.
Common questions
What is the Kirchhoff's Voltage Law formula?
Kirchhoff's Voltage Law is written ΣV = 0. Sum of voltage changes around closed loop is zero. It belongs to Electricity & Magnetism, under Electric Circuits.
What are the units in ΣV = 0?
In SI units, ΣV is sum of voltages, measured in kg·m²/(A·s³).
How is the Kirchhoff's Voltage Law formula derived?
Conservation of energy in circuit. The result is ΣV = 0.