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Unformatted text preview: Note-A-Rific: Kirchhoffs We sometimes encounter a circuit that is too complicated for simple analysis. Maybe there is a mix of series and parallel, or more than one power source. To deal with such complicated circuits, we use Kirchhoffs rules, invented by G. R. Kirchhoff (1824-1887) His rules are just convenient applications of the laws of conservation of charge and energy. In the previous section, you were already (sort of) using his rules, even if you didnt know it. Kirchhoff's First (or Junction ) Rule is based on the conservation of charge, and we already used it in deriving the rule for parallel resistors. At any junction point, the sum of all currents entering the junction must equal the sum of all currents leaving the junction. This just means that when current reaches the branches in a parallel circuit, it will split up and take different routes. When the branches come back together, the currents will add back together too. Kirchhoffs Second (or Loop ) Rule is based on the conservation of energy....
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