ABSTRACT
This chapter discusses the analysis of circuits containing just resistors and direct current (DC) sources. Kirchhoff's current law states that at any junction in an electrical circuit, the current entering it equals the current leaving it. Kirchhoff's voltage law states that around any closed path in a circuit, the sum of the voltage drops across all the components is equal to the sum of the applied voltage rises. Circuit elements are said to be connected in series when each element carries the same current as the others; they are in parallel with one another when the same voltage appears across each of the elements. A series, parallel circuit is one that contains combinations of series and parallel, connected components. The voltage across any equivalent resistance in a series circuit is the source voltage multiplied by the ratio of the resistance to the total resistance of the circuit. For a parallel circuit it has a current division rule.
