Kirchhoff's law Kirchhoff's law is the basic law of voltage and current in the circuit, and it is the basis of analyzing and calculating more complex circuits. It was put forward by German physicist G.R. Kirchhoff (1824 ~ 1887) in 1845.
It can be used to analyze DC circuits, AC circuits and nonlinear circuits with electronic components.
Kirchhoff's law is based on the law of charge conservation, ohm's law and voltage loop theorem, and it is strictly established under the condition of stable current. When Kirchhoff's first equation and the second equation are used together, the current values of each branch in the circuit can be calculated correctly and quickly. Kirchhoff's law is a proper term of metallurgy.