C3-activities - ELECTRIC CIRCUITS ECSE-2010 TODAYS AGENDA...

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1 ELECTRIC CIRCUITS ECSE-2010 Class 3 TODAY’S AGENDA ± Equivalent Circuits ± PSpice – An Introduction ± Electrical Measurements ² Resistance Bridges ² Experiment #1 ² Should Finish Almost All of Experiment #1 in Class ² See Experiment Info Sheet for Report Format RESISTORS IN SERIES 1 R 2 R v + i 1 i 2 i 1 v + 2 v + 12 KCL: i i i == When same current flows through resistors They are in Series => VOLTAGE DIVIDER RULE 1 1 R v R R ⎛⎞ = ⎜⎟ + ⎝⎠ 2 2 R v R = + Only Works for Resistors in Series 1 R 2 R v + i 1 i 2 i 1 +− 2 v + RESISTORS IN PARALLEL 1 R 2 R eq R eq RR R = + v + v + i i eq 1 2 11 1 R =+
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2 RESISTORS IN PARALLEL 1 R 2 R v + i 1 i 2 i 1 v + 2 v + 12 eq RR v R iR R == + eq 2 2 22 iR v i 21 2 i RRR ⎛⎞ = ⎜⎟ + ⎝⎠ 1 R i = + Current Divider Rule 2 1 R ii = + REVIEW 1 1 R v v R R = + 2 2 R v R = + Only Works for Resistors in Series Voltage Divider Rule 2 R v + i 1 + 2 v + 1 R REVIEW 2 1 R i i R = + 1 2 R i R = + Only Works for Resistors in Parallel Current Divider Rule 1 R 2 R v + i 1 i 2 i EQUIVALENT SOURCES s v s R v + ss vv i R =− i s i s R v + i s s s v( i i ) R iR i R =− = − s s s v Same Circuit if i R = EQUIVALENT SOURCES s v s R v + i s i s R v + i = s s s v i R = "Source Conversion"
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3 EQUIVALENT SOURCES = 2 i 12 vv + 1 v 2 v EQUIVALENT SOURCES = 1 i 2 i ii + CIRCUIT REDUCTION ± Whenever Possible, Replace Series and Parallel Resistors with their Equivalent Resistance: ± Whenever Possible, Replace Series Voltage Sources and Parallel Current Sources with their Equivalent Sources: ± Sometimes, Replace Voltage Source, v s , in Series with a Resistor, R s , with a Current Source of i s = v s /R s , in Parallel with Resistor, R s REVIEW eq xx Find R "seen" by the Source Find i, v ; Relate i to i 30 V 6 6 12 5 4 16 i Ladder Network x i x v + PSpice
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This note was uploaded on 10/21/2010 for the course ECSE 2010 taught by Professor Millard during the Spring '08 term at Rensselaer Polytechnic Institute.

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C3-activities - ELECTRIC CIRCUITS ECSE-2010 TODAYS AGENDA...

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