0The ideas of electrical source and load are extremely useful constructs in circuit analysis since all electronic circuits can be modeled as a source circuit, a load circuit, or some combination of the two. Source circuits are circuits that supply energy while load circuits are circuits that dissipate energy. Load circuits can be simply modeled by a single equivalent impedance, while source circuits can be modeled as a voltage or current source plus an equivalent impedance. This section describes the properties of practical voltage and current sources; how to represent the output of arbitrary circuits as source circuits; and how the source and load model of electronic circuits can be used to model circuit behavior.
