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Unformatted text preview: 1 ECE 201, Lecture 4 Kirchhoff’s Laws Computation of power, passive sign convention; P absorbed = V 12 × I 12 , but Math may be complicated; Ohm’s Law: V 12 = I 12 × R Not V = I × R ! Resistors in serial and parallel; Resistivity Summary of previous lecture 2 Example • A generates 20W of power, find V A • Find power absorbed by B • If element C generates 3W of power, find V c • If element D absorbs 27W of power, find I D • If element E absorbs 2W of power, find I E • Find the power absorbed by element F Answers (Please use the formulas in the previous slide): (1) V A = 5 V, (2) P B = 14 W, (3) V C = −1 V, (4) I D = − 9 A, (5) I E = 2 A, (6) P F = − 20 W. 3 Four dependent sources • Voltage controlled voltage source • Current controlled voltage source • Voltage controlled current source • Current controlled current source • V x , I y , V z and I w are voltages and currents specified elsewhere in the circuit. • Each dependent source provides an equation in circuit analysis. 1.3 I w 2.6 V z + _ 3.2 I y + _ 2.5 V x 4 Example Find R so that V out /V in =150 + I 1 V in 10I 1 V R V out 10 Ω 10 Ω + + 5V R 1 1 1 10 10 5 50 50 150 10 30 in R out R in in V I V I R V V I R V R V R = Ω = = = = = Ω = Ω 1 1 1 10 10 1 1 5( ) 10 50 500 500 150 10 3 in in R out R R in in V I V V I R R V V V I R V R V...
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This note was uploaded on 02/13/2012 for the course ECE 201 taught by Professor All during the Fall '08 term at Purdue.
 Fall '08
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