Linear Circuit analysis ( ELE101 )

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# Linear Circuit analysis ( ELE101 ) - PowerPoint PPT Presentation

6 th Oct, 2009. Linear Circuit analysis ( ELE101 ). Course Instructor : Engr. Khalil Ullah Lecturer Dept. of Electrical Engineering City University. Contents of Today’s Lecture. Course Syllabus Tentative Schedule An Important Note to the Students Introduction Before we begin

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6th Oct, 2009

### Linear Circuit analysis (ELE101)

Course Instructor: Engr. KhalilUllah

Lecturer Dept. of Electrical Engineering City University

Contents of Today’s Lecture
• Course Syllabus
• Tentative Schedule
• An Important Note to the Students
• Introduction
• Before we begin
• Hints on problem solving
• Basic Definitions
An Important Note to the Students
• This is your first course in electrical engineering. Although electrical engineering is an exciting and challenging discipline, the course may intimidate you. A good textbook and a good professor are an advantage but you are the one who does the learning. If you keep the following ideas in mind, you will do very well in this course.
• This course is a foundation for other courses
• Solving problems is an essential part of learning
• At the end of each chapter we will have a real-life example related to chapter being taught.
• Attempt the exercise and some review questions at the end of each chapter
• U should have strong mathematical background specially in matrices
Introduction
• Technology is rapidly changing the way we do things; we now have computers in our homes,electronic control systems in our cars,cellular phones that can be used just about anywhere,robots that assemble products on production lines,and so on.
• A first step to understanding these technologies is electric circuit analysis.
• Circuit Analysis provides you with the knowledge of basic principles that you need to understand the behavior of electric and electronic devices,circuits,and systems.
• In this course,we will develop and explore its basic ideas.
Before We Begin
• Let us look at a few examples of the technology at work.
• As we go through these, we will see devices and components that are not yet been discussed. Just concentrate on general Ideas.
• As a first example, consider a VCR(Charles Ginsburg and Ray Dolby 1956 )
• Its design is based on electrical, electronic and magnetic circuit principles.
• For example, resistors, capacitors, control the voltages and currents that operate its motors and transistors amplify the audio and video signals that are the heart of the system.
Example 1
• Figure 1. VCR Internal Circuitry
Hints on Problem Solving
• Make a sketch (e.g.,a circuit diagram),mark on it what you know,then identify what it is that you are trying to determine.
• Watch for “implied data”such as the phrase “the capacitor is initially uncharged”. (As you will find outlater,this means that the initial voltage on the capacitor is zero.)
• Think through the problem to identify the principles involved,then look for
• relationships that tie together the unknown and known quantities.
• Substitutetheknowninformationintotheselectedequation(s)andsolvefortheunknown.
• Check the answer to see that it is sensible—that is,is it in the “right ballpark”? Does it have the correct sign? Do the units match?
Linear Circuit Analysis
• Circuit:
• A closed path followed or capable of being followed by electric current
• A configuration of electrically or electromagnetically connected components are devices.
• An electric circuit is a connection of components (Voltage/Current sources; Resistors; Inductors & Capacitors ) such that there is some power supplied and dissipated. This means that if you connect a resistor to a battery using conductor wires, then you have created an electrical circuit.
• Circuits are represented on a paper using diagrams
Circuit Diagrams
• Block diagrams:
• The
• The over all circuits is broken into blocks.
• Each block represent a portion of the system.
• Flow is from left to right

Pictorial Diagram:

• This helps in visualizing circuits and their operation by showing components as they actually appear.

Schematic Diagram:

• Use simplified standard symbols to represent circuit components
Linear Circuit
• That circuit which, for a sinusoidal input voltage of frequency f, any output of the circuit is also sinusoidal with frequency f.
• Which obey the superposition principle. i.e.
• linear circuit is one in which the values of the components, the resistance, capacitance, inductance, etc. don\'t change with the level of voltage or current in the circuit.
• Examples:
• Amplifiers, Differentiators, Integrators
Circuit Analysis Contd….
• The process of finding the voltage across and current flowing through each component in the circuit.
• Different techniques are used to analyze a circuit
• laws and the principles, concepts, mathematical relationships, and methods of analysis that have evolved from them are known as circuit theory
• Circuit analysis is a special case of emf theory which concentrates on static and moving electric charges
Circuit Analysis
• There are three basic assumptions in circuit analysis