Superposition theorem In any linear resistive network containing several sources. The voltage across or the current through any resistor or source may be calculated by adding algebraically all the individual voltage or current caused by each independent source acting alone, with all other independent voltage sources replaced by short circuit and all other independent current sources replaced by open circuit. Note that dependent sources are in general active in every experimentIn any linear resistive network containing several sources. The voltage across or the current through any resistor or source may be calculated by adding algebraically all the individual voltage or current caused by each independent source acting alone, Note that dependent sources are in general active in every experiment. Superposition theorem: with all other independent voltage sources replaced by short circuit and all other independent current sources replaced by open circuit