Kirchhoff's laws

British  

plural noun

1. two laws describing the flow of currents in electric circuits. The first states that the algebraic sum of all the electric currents meeting at any point in a circuit is zero. The second states that in a closed loop of a circuit the algebraic sum of the products of the resistances and the currents flowing through them is equal to the algebraic sum of all the electromotive forces acting in the loop

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Etymology

Origin of Kirchhoff's laws

C19: after G. R. Kirchoff (1824–87), German physicist