Fundamentals of Electric CircuitsSchool of AutomationLecturer: Dr. Guo Sihai（郭四海）Email: guosihaiwhut.edu.cnIntroduction ContentsOverviewContent introduceTeaching book and other resourceAttentions and regulationssuggestion2Circuit book3Circuit book4Circuit book5Circuit book6Circuit book and resource7Circuit book and resourceEmail:whutdgx2010126.com Password:2010dgx8Circuit book and resource9Hot TipvNotice: 15% of the total score One time, sub 5 point10vLab: 15% of the total scorevExam: 70% of the total score Wish everyone successOverview of the Course vWhy electric circuits theory is important? Fundamental theoryupon which all branches of electrical engineering are built Good model for the study of energy systems in generalObjective: Analysis of the circuitsnHow does it respond to a given input?nHow do the interconnected elements and devices in the circuit interact?11电路原理电路原理相互融合的相互融合的信息系统信息系统 (无处不在的无处不在的IT产业产业)公共公共 基础基础专门专门 技术技术应用应用 领域领域电力系统电力系统 (能量传输与处理能量传输与处理)控制系统控制系统 (信号反馈与处理信号反馈与处理)通信系统通信系统 (信号传输与处理信号传输与处理)信号处理系统信号处理系统*计算机系统计算机系统电力电子技术电力电子技术 (关注大功率关注大功率)通信电路通信电路 (关注高频段关注高频段)微电子技术微电子技术 (集成芯片设计集成芯片设计)模拟电子线路模拟电子线路数字电子线路数字电子线路信号与系统信号与系统*：指各类信号处理课程，包括某些专业的专门课程（如生物医学工程、核电子学等）。：指各类信号处理课程，包括某些专业的专门课程（如生物医学工程、核电子学等）。The follow- up courses12Overview of the Course circuit analysis: process of studying and analyzing the various electrical quantities(电量电量) involved, especially the voltages(电压电压) and currents(电流电流) through calculations.Fundamentals of Electric Circuit: basic concepts, theorems, methods of analysis of electric circuits. Foundation on which most other courses in the electrical engineering curriculum rest. 13Deals with a subject known as linear circuit analysis(线性电路分析线性电路分析).linear circuit- - - the equations characterized the circuits are linear algebraic or linear differential equations. Why linear circuit analysis lMany systems behave in an approximately linear fashion over a limited range. lLinear problems are more easily solved seek reasonably accurate linear approximations to physical situations.Overview of the Course14Linear circuit analysis can be separated into three broad categories: resistive circuit analysis(电阻电路分电阻电路分 析析), time- domain analysis, （时时域分析）域分析）and frequency- domain analysis（频域分析）（频域分析）. Resistive circuit analysis：consist solely of source(电电 源源) and resistors(电阻电阻). - - - - -basic analysis techniques. Time- domain: capacitors(电电容容) and inductors(电电感感) are also included. differential equations ,obtain expressions valid for all times. Frequency- domain analysis: capacitors and inductors are also included. transform differential equations into algebraic equations.Overview of the Course15Relationship of Circuit Analysis to EngineeringCircuit analysis is typically the course in which electrical engineers learn how to analyze a problem. It is important to learn how To be methodical To determine the goal of a particular problem To implement the plan to obtain a solution To verify that the proposed solution is accurate Therefore, we, in this course, not only learn the knowledge about electric circuit analysis, but also are actually building the analytical skills that will help us in other academic subject(学学科科) as engineers.16Analysis and DesignThe task of circuit design: determine what type of circuit will perform the given function.The main task of circuit analysis: analyze the behavior of an electric circuit to see how it responds to a given input.One key difference between analysis and design is that we expect a single, unique answer as a general rule when analyzing an electric circuit. Design on the other hand, typically has no unique solution.17Analysis and Design18Actual circuitCircuit ModelAnalysisSolving equations (Algebra, ordinary differential equations, partial differential)ResultCircuit AnalysisCircuit Design(synthesis)Computer- Aided AnalysisThe use of computer to solve equations arising from circuit analysis is by no mean a new idea.However, circuit analysis software is by no means replacement for good old- fashioned paper- and- pencil analysis for a number of reasons:lWe need to have a solid understanding of how circuits work to develop an ability to design them.lprogramsoftenhavebugs,andevenmore frequently, users often enter information incorrectly.19触触类类旁旁通通原理应用20it/s315toi ui otHot Tip举举一一反反三三方法变化21Hot TipThe first volume IntroduceDC CircuitsBasic LawsBasic ConceptsMethods of AnalysisFirst- Order CircuitsCircuit TheoremsOther content22The Second volume IntroduceText in hereLaplace TransformTwo- Port NetworksAC CIRCUITS23Ch1 Basic Concepts(基基本概念本概念) Ch2 Basic Laws(基基本定律本定律)Ch3 Methods of Analysis(电路基电路基本本分析分析方法方法) Ch4 Circuit Theorems(电路电路定律定律)Ch5 The Operational Amplifier(运运算算放放大大器器)Ch6 Capacitors and Inductors(电电容和容和电电感感)Ch7 First- Order Circuits(一阶一阶电路电路)Ch8 Second- Order Circuits（二阶二阶电路）电路）Contents24ContentsCh9 Sinusoids and Phasors (正弦正弦与相量与相量)Ch10 Sinusoidal Steady- State Analysis(正弦稳态正弦稳态电路电路)Ch11 AC P