Kirchhoff's law(s), named after Gustav Robert Kirchhoff, is a term applied to two entirely different concepts.

• Kirchhoff's circuit laws: This is a pair of rules (common in electrical engineering) to analyze electric circuits, which can be derived from Maxwell's equations.
• Kirchhoff's law (thermodynamics) is a theorem about thermal radiation from heated objects, equating emission and absorption, and is derived from general considerations of thermal equilibrium.

See also

• Scientific laws named after people