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Unformatted text preview: 1 ECE 201 Lecture 7 Announcements • Test on next Thur. 9/14, 8 days from now. • Test covers Lectures 19 • Review Session: Mon. 9/11, 79pm WTHR 200 • It would be good to review Matlab and Linear Algebra (read Appendix A1, p954~960). 2 Summary of previous lecture • Dependent sources as 3terminal active devices; • Active elements introduce novel circuit behaviors, such as negative resistance; • Nonideal sources and their models; • Simplifying circuit topologies. 3 In this lecture • We learn how to write down equations (KCLs, KVLs and Ohm’s laws) for a circuit systematically ; • First we need to know the unknowns: all branch currents and branch voltages; • Identify the number of independent variables, and write down the same number of independent equations, no more and no less. 4 Nodes, Branches and Loops • 5 nodes • 8 branches • 4 loops (4 unknown loop currents) • Select one node as the reference V reference =0 (typically the one with the largest number of connections) • Assign all other nodes a voltage (4 unknown node voltages • Branch voltages: V jk =V jV k 5 3A R1 2Ω R2 5Ω R3 1Ω 2A G A B Ex 1: Determine V A and V B ....
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This note was uploaded on 02/03/2012 for the course ECE 201 taught by Professor All during the Fall '08 term at Purdue.
 Fall '08
 ALL

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