6 002 CIRCUITS AND ELECTRONICS Introduction and Lumped Circuit Abstraction Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 ADMINISTRIVIA Lecturer Prof Anant Agarwal Textbook Agarwal and Lang A L Readings are important Handout no 3 Web site http web mit edu 6 002 www fall00 Assignments Homework exercises Labs Quizzes Final exam Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 Two homework assignments can be missed except HW11 Collaboration policy Homework You may collaborate with others but do your own write up Lab You may work in a team of two but do you own write up Info handout Reading for today Chapter 1 of the book Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 What is engineering Purposeful use of science What is 6 002 about Gainful employment of Maxwell s equations From electrons to digital gates and op amps Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 6 002 Nature as observed in experiments V 3 6 9 12 I 0 1 0 2 0 3 0 4 Physics laws or abstractions Maxwell s abstraction for Ohm s tables of data V RI Lumped circuit abstraction R V C L M Simple amplifier abstraction Digital abstraction Operational amplifier abstraction abstraction Combinational logic S f Filters Clocked digital abstraction Analog system components Modulators oscillators RF amps power supplies 6 061 Instruction set abstraction Pentium MIPS 6 004 Programming languages Java C Matlab 6 001 Software systems 6 033 Operating systems Browsers Mice toasters sonar stereos doom space shuttle 6 455 6 170 Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 Lumped Circuit Abstraction Consider The Big Jump from physics to EECS I V Suppose we wish to answer this question What is the current through the bulb Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 We could do it the Hard Way Apply Maxwell s Differential form B Faraday s E t Continuity J t Others E 0 Integral form B E dl t q J dS t q E dS 0 Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 Instead there is an Easy Way First let us build some insight Analogy F a I ask you What is the acceleration You quickly ask me What is the mass I tell you m F You respond a m Done Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 Instead there is an Easy Way First let us build some insight Analogy F a In doing so you ignored the object s shape its temperature its color point of force application Point mass discretization Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 The Easy Way Consider the filament of the light bulb A B We do not care about how current flows inside the filament its temperature shape orientation etc Then we can replace the bulb with a discrete resistor for the purpose of calculating the current Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 The Easy Way A B Replace the bulb with a discrete resistor for the purpose of calculating the current A I V and I V R R B In EE we do things the easy way R represents the only property of interest Like with point mass replace objects F with their mass m to find a m Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 The Easy Way A V I R and B I V R In EE we do things the easy way R represents the only property of interest R relates element v and i V I R called element v i relationship Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 R is a lumped element abstraction for the bulb Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 R is a lumped element abstraction for the bulb Not so fast though I A S A V B SB black box Although we will take the easy way using lumped abstractions for the rest of this course we must make sure at least the first time that our abstraction is reasonable In this case ensuring that V I are defined for the element Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology Downloaded on DD Month YYYY 6 002 Fall 2000 Lecture 1 A I SA V V B I must be defined for the element SB black box Cite as Anant Agarwal and Jeffrey Lang course materials for 6 002 Circuits and Electronics Spring 2007 MIT OpenCourseWare http ocw mit edu Massachusetts Institute of Technology
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