EEE 1131: Electrical Circuits

Prepared By :

Md. Rezaur Raihan

Assistant Professor

Department of Electrical and Electronic Engineering

Khulna University of Engineering & Technology

Referrence Books

1. A Textbook of Electrical Technology.

Vol 1: Basic Electrical Engineering By B L Therajaand A K Theraja.

2. Introductory Circuit Analysis by Robert LBoylestad .

3. Fundamentals of Electric Circuits By Charles K.Alexander and Matthew N. O. Sadiku

Generation of Alternating Voltage

Generation of Alternating Voltage

Introduction

A sinusoid is a signal that has the form of the sine orcosine function.

A sinusoidal current is usually referred to as alternatingcurrent(ac).

Such a current reverses at regular time intervals and hasalternately positive and negative values. Circuits driven bysinusoidal current or voltage sources are called ac circuits.

Introduction

We are interested in sinusoids for a number of reasons.First, nature itself is characteristically sinusoidal.

We experience sinusoidal variation in the motion of apendulum, the vibration of a string, the ripples on theocean surface, and the natural response of underdampedsecond order systems, to mention but a few.

Second, a sinusoidal signal is easy to generate andtransmit. It is the form of voltage generated throughout

Introduction

Third, through Fourier analysis, any practical periodicsignal can be represented by a sum of sinusoids.Sinusoids, therefore, play an important role in the analysisof periodic signals.

Lastly, a sinusoid is easy to handle mathematically. Thederivative and integral of a sinusoid are themselvessinusoids. For these and other reasons, the sinusoid is anextremely important function in circuit analysis.

Sinusoids

Sinusoids

Graphical Approach to compare Sinusoids

Graphical Approach to compare Sinusoids

Numerical Problem

Numerical Problem

Numerical Problem

Numerical Problem