Basic DC Theory DC CIRCUIT ANALYSISDC CIRCUIT ANALYSISAll of the rules governing DC circuits that have been discussed so far can nowbe applied to analyze complex DC circuits. To apply these rules effectively, loopequations, node equations, and equivalent resistances must be used.EO 1.15 Given a simple DC circuit, DETERMINE theequivalent resistance of series and parallelcombinations of elements.LoopEquationsAs we have already learned, Kirchhoff’s Laws provide a practical means to solve for unknownsin a circuit. Kirchhoff’s current law states that at any junction point in a circuit, the currentarriving is equal to the current leaving. In a series circuit the current is the same at all pointsin that circuit. In parallel circuits, the total current is equal to the sum of the currents in eachbranch. Kirchhoff’s voltage law states that the sum of all potential differences in a closed loopequals zero.Using Kirchhoff’s laws, it is possible to take a circuit with two loops and several power sources(Figure 37) and determine loop equations, solve loop currents, and solve individual elementcurrents.Figure 37 Example Circuit for Loop EquationsRev. 0 Page 49 ES-02

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