5.6 Superposition of Sources If a circuit comprises two or more sources, each source acts independently of the others, and the current is the algebraic sum of the currents produced by the individ- ual sources xample. a circuit of three resistors and two sources as in Fig 5-9 3 Figure 5-9 The current flowing through the circuit is the algebraic sum of the current due to the 6-volt battery. plus that due to the 12-volt battery 12v