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Unformatted text preview: 1 ECE 201, Lecture 4 Computation of power, passive sign convention; Formulas are simple: P=V*I, but Math may be complicated; Ohm’s Law; Resistors in serial and parallel; Capacitors. Summary of previous lecture 2 Example: P1.48 in textbook 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 R = Ω = = Ω = Ω = = Ω = = Ω = Ω R + I 1 V in 10I 1 V R V out 10 Ω 10 Ω + + 5V R + R 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. 1.3 I w 2.6 V z + _ 3.2 I y + _ 2.5 V x 4 Short circuit and Open circuit Regular resistors 1—1MΩ One piece of metal 108106 Ω One piece of doped semiconductor ~ ΩkΩ One piece of wood (insulator) >10 9 Ω (1) Short circuit (zero resistance): R=0, V=IR=0 V for all current (2) Open circuit (infinite resistance): R→ ∞, I=V/R=0 A for all voltage In circuit diagrams, all thin lines have zero resistance 5...
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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 University.
 Fall '08
 ALL

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