 By Noel M. Morris

This simple undergraduate textual content offers with the critical components of electric engineering conception, starting from uncomplicated resistive circuits to Fourier and brief research. The e-book starts off with a research of parts and legislation, and progresses via DC circuit research. After a research of sinusoidal research, the reader is proven how those theorems and strategies may be utilized to AC circuits. each one bankruptcy is totally supported by means of quite a few labored examples and unworked difficulties (with solutions). A bankruptcy is dedicated to using SPICE software program for the answer of program difficulties. This ebook is designed to be of curiosity to undergraduate and HNC/HND scholars of digital and electric engineering.

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Additional resources for Electric Circuits

Example text

Also, it is observed that Vz = 15(/1 - lz) Inserting the above value for v2 into the loop equation gives 0 = 360/1 - 340/z 40 And for mesh 3 the equation is 25v2 or, since v2 = 15(/1 - 20 = 30h - lz) -20 = -375/1 + 375/z + 30/3 and the matrix form of the circuit equations becomes 25 -15 360 -340 -375 375 Note that the 3 X 3 matrix is not symmetrical about the major diagonal, and some of the non-diagonal elements have positive values. This is due to the presence of the dependent voltage source in the circuit.

Although network topology follows the rules of KCL and KVL, it is of great value as an introduction to the field of state variable analysis, in which the variables mentioned above are the state variables. 7(b). The nodes are shown as dots on the graph. 7 Tree (or spanning subtree): this is a set of branches connecting all the nodes in the network, but containing no loops. A network may contain several trees. Cotree: this is the set of branches which do not belong to a given tree. Any branch of the cotree is called a link.

If the circuit contains only current sources, apply KCL to each of the non-reference nodes. 6), relate the source current to the unknown node voltages. 3. 7), replace each source by a short circuit; the node voltages assigned in step 1 must not be changed. Each voltage source should be related to the unknown node voltages assigned in step 1 above. If a voltage source is a practical source, it can be converted to its equivalent current source (see Chapter 9 for details) and dealt with as outlined in step 2 above.