Electric Circuits 8th Edition 120

Electric Circuits 8th Edition 120 - 96 Techniques ncuit...

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96 Techniques of Cncuit Anatysh f- Fi$re 4.4 a ne circuit shown in Fig. 4.3 with rix unknou,n bEnch cunents defined. b - (n - 1) loops (or neshes). These obseryations also are valid in terms of essential nodes and essential branches. Thus iI we lel ne represent the number of essential nodes atrd 4 the number of essential branches where the current js unlno*n, we car apply Kirchhoffs current law at n. - I oodes and Kirchhoffs voltage law around 4 - (n - 1 ) loops or meshes. In circuits, the Dumber oI essential nodes is less than or eoual to the num- ber of nodeq and the number of essential bmnches is less than or eoual to the num ber ot branches. Th us it is ofletr conven ient to use essential nodes and essential branches when anallzing a circuit, because they produce fewer independent equations to solve. A circuit may consist of disconnected parts. An example of such a cir- cuit is examined in Problem 4.3. The statements pe aining to the number of equations that can be derived from Kirchhoffs curent law, r
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