ABSTRACT
This chapter talks about the analysis of circuits containing resistors and direct current (d.c). It discusses the technique Norton's theorem and Thevenin's theorem which uses the concept of constant voltage and constant current sources. An ideal voltage source is one that gives a constant electromotive force (e.m.f). Regardless of what current is drawn from it, that is whatever load resistance is connected between its terminals. A real voltage source gives an e.m.f. which depends on the current drawn and can be considered to be an ideal voltage source in series with its internal resistance. A current source can be regarded as an ideal current source in parallel with an internal resistance. An ideal current source is one that supplies a constant current regardless of the load resistance connected to its terminals; a real current source supplies a current which depends on the load resistance.
