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ECE201_4_Qi - ECE 201 Lecture 4 Summary of previous lecture...

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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
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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 10 + - + - 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 = = = = = = = 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 = = = = = R + - I 1 V in 10I 1 V R V out 10 10 + - + - 5V R + R -
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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
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4 Short circuit and Open circuit Regular resistors 1—1MΩ One piece of metal 10 -8 -10 -6 Ω One piece of doped semiconductor ~ Ω-kΩ 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
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