107_11 - 1 Electrical Engineering Technology EET 107...

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Unformatted text preview: 1 Electrical Engineering Technology EET 107 Introduction to Circuit Analysis Lecture # 11 Professor Robert Herrick Purdue University © EET 107 - 11 Introduction to Circuit Analysis 2 Summary Ohm’s Law – An Experiment Ohm’s Ohm’s Law of Resistance Ohm’s Nonlinear Resistance Nonlinear Simulators Simulators Purdue University © EET 107 - 11 Introduction to Circuit Analysis 3 Ohm’s Law Ohm’s Law Ohm’s An Experiment An Purdue University © EET 107 - 11 Introduction to Circuit Analysis 4 Ohm’s Law Experiment IR IR mA E R 100 Ω Purdue University © + VR − E EET 107 - 11 R 100 Ω + VR - V Introduction to Circuit Analysis 5 Ohm’s Law Experiment IR IR (mA) 40 10 mA E 1V R 100 Ω + VR - 30 1V 20 10 VR (V) 0 Data Test Point Purdue University © 1 2 3 4 Forward Characteristic Curve EET 107 - 11 Introduction to Circuit Analysis 6 Ohm’s Law Experiment IR (mA) 40 −4 Linear Curve 4 0 VR (V) and VR related by a -40 CONSTANT Characteristic Curve Purdue University © IR EET 107 - 11 Introduction to Circuit Analysis 7 Ohm’s Law Ohm’s Law Ohm’s rd 3 Purdue University © Major Law EET 107 - 11 Introduction to Circuit Analysis 8 Ohm’s Law – Data Point VR IR = R 4V IR = = 40 mA 100 Ω Purdue University © EET 107 - 11 Introduction to Circuit Analysis 9 Ohm’s Law – V Polarity & I Direction IR R + VR − R − VR + IR Voltage potential lost as current flows through a dissipating component ! ! ! Purdue University © EET 107 - 11 Introduction to Circuit Analysis 10 Ohm’s Law – V Polarity & I Direction R IR R + VR − − VR + IR Voltage potential lost as current flows through a dissipating component ! ! Purdue University © EET 107 - 11 Introduction to Circuit Analysis 11 Ohm’s Law – Example IR E 6V R 1 kΩ E 6V R 1 kΩ + VR - Establish I direction and V polarities ! Purdue University © EET 107 - 11 Introduction to Circuit Analysis 12 Ohm’s Law – Example IR E 6V R 1 kΩ + VR - 6mA operating point IR (mA) + 6V - 6 4 2 VR = E = 6 V VR 6 V IR = = = 6 mA R 1 kΩ Purdue University © 0 EET 107 - 11 2 4 6 VR (V) Introduction to Circuit Analysis 13 Ohm’s Law – Example IR 6 mA E 6V R 1 kΩ + VR - 6V Lab setup. Purdue University © EET 107 - 11 Introduction to Circuit Analysis 14 Ohm’s Law – Example +6 V +6 V E 6V raise of 6 V R 1 kΩ 0V Bubble notation ? Purdue University © EET 107 - 11 Introduction to Circuit Analysis 15 Ohm’s Law – Basic Forms VR IR = R V I R VR = R I R VR R= IR Purdue University © EET 107 - 11 Introduction to Circuit Analysis 16 Ohm’s Law – Basic Forms VR IR = R If you know two variables you can find the unknown ! ALGEBRA Purdue University © EET 107 - 11 Introduction to Circuit Analysis 17 Ohm’s Law – Parallel Circuit Example R3 IR1 E R1 390 + 6V − Purdue University © 6 mA R2 1k EET 107 - 11 1.82 mA + VR2 − + 4V − R4 Introduction to Circuit Analysis 18 Ohm’s Law – Parallel Circuit Example VR1 6V I R1 = = = 15.4 mA R1 390 Ω VR2 = R2 × I R2 =1 kΩ × 6 mA = 6 V VR4 4V R4 = = = 220 Ω I R4 1.82 mA Purdue University © EET 107 - 11 Introduction to Circuit Analysis 19 Ohm’s Law – Resistive Networks 10 mA Resistive Circuit 12 V Rcircuit Rcircuit = Purdue University © 12 V = 1.2 kΩ 10 mA EET 107 - 11 Introduction to Circuit Analysis 20 Nonlinear Resistance Nonlinear Purdue University © EET 107 - 11 Introduction to Circuit Analysis 21 Nonlinear Resistance forward biased Silicon Diode Characteristic Curve Idiode nonlinear knee −100 V 0.7 V Vdiode reverse biased Purdue University © EET 107 - 11 Introduction to Circuit Analysis 22 Nonlinear Resistance Idiode forward knee voltage −100 V 0.7 V Vdiode reverse knee voltage Purdue University © EET 107 - 11 Piecewise Linear 3 distinct lines instead of curves with knees. Introduction to Circuit Analysis 23 Nonlinear Resistance R E 12 V + VR − 20 mA + 2.5 V − ILED (mA) 20 VR = −2.5V + 12V = 9.5 V 0 VR 9.5 V R= = = 475Ω I R 20 mA Purdue University © 2.5 VLED (V) LED characteristic curve EET 107 - 11 Introduction to Circuit Analysis 24 Simulators Simulators Pick and place software that simulates circuits and performs simple and complex analysis ! Purdue University © EET 107 - 11 Introduction to Circuit Analysis 25 Multisim Multisim PSpice PSpice also known as Ø OrCAD Ø Cadence Purdue University © EET 107 - 11 Introduction to Circuit Analysis 26 Multisim Simulation + 4.004m A E 4V R 1.0kohm + - Purdue University © EET 107 - 11 4.000 V Introduction to Circuit Analysis 27 PSpice – OrCAD – Cadence 40.00mA 4.000V E R1 100 4Vdc 0V Purdue University © EET 107 - 11 Introduction to Circuit Analysis 28 Multisim Simulation Esupply_pos 7 1 5 U1a LM741AH/883 15V 3 Ein 6 2 1V Esupply_neg 4 + - 1.436m A 15V Rf + - 1.001 V - + 1.002m A 3.3kohm Ri 1.0kohm Purdue University © EET 107 - 11 Rload 10kohm + - 4.307 V Introduction to Circuit Analysis 29 Multisim CH A e_supply CH B VC(t) Purdue University © EET 107 - 11 Introduction to Circuit Analysis 30 Summary Ohm’s Law – An Experiment Ohm’s Ohm’s Law of Resistance Ohm’s Nonlinear Resistance Nonlinear Simulators Simulators Purdue University © EET 107 - 11 Introduction to Circuit Analysis ...
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This note was uploaded on 02/22/2012 for the course ECET 107 taught by Professor Staff during the Fall '08 term at Purdue University-West Lafayette.

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