Definition:  circuittheory theorem stating that the electric current in any branch of a passive linear electric network and the potential difference between any two points in such a network, resulting from the simultaneous application of a number of source voltages or source currents distributed in any manner whatsoever throughout the network, is the algebraic sum of the currents in that branch and the algebraic sum of the potential differences between those two points, that would be caused by the individual source voltages or currents acting separately
