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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

Linear Circuit analysis ( ELE101 )

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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