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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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Linear circuit analysis ele101

6th Oct, 2009

Linear Circuit analysis (ELE101)

Course Instructor: Engr. KhalilUllah

Lecturer Dept. of Electrical Engineering City University

Contents of today s lecture
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

Tentative schedule course outline
TentativeSchedule (Course Outline)

Tentative schedule course outline1
TentativeSchedule (Course Outline)

An important note to the students
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


  • 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
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
Example 1

  • Figure 1. VCR Internal Circuitry

Hints on problem solving
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
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
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

Linear circuit analysis ele101

  • Pictorial Diagram:

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

Linear circuit analysis ele101

Linear circuit
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
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
Circuit Analysis

  • There are three basic assumptions in circuit analysis