# Electric

**Topics:**Alternating current, Electrical engineering, Direct current

**Pages:**17 (836 words)

**Published:**September 23, 2014

Circuits (EE201)

By

Dr. Eng. Omar Abdel-Gaber M. Aly

omar.aly@aun.edu.eg

Assistant Professor

Electrical Engineering Department

College of Engineering Al-Majmaa

Al-Majmaa University

Schedule & Instructors

Schedule:

As indicated in Students Schedule

Instructors: Dr. Omar Abdel-Gaber

(omar.aly@aun.edu.eg)

Office hours: Saturday (01:02 pm),

or by appointment.

TAs:

Eng. Mohamed AbdelRaheem

Office hours: As indicated in Students Schedule

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Fundamentals of Electric Circuits EE201, by Dr. Omar Aly

Recommended Texts

“Fundamentals of Electric Circuits”

Author: Charles Alexander, Matthew Sadiku, 2008

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Fundamentals of Electric Circuits EE201, by Dr. Omar Aly

Grading

EE201 Grade breakup:

First Midterm exam :

20

Second Midterm exam :

20

Quizzes (4 or 5 times) :

5

Class Attendances:

5

Lab and Exercises

10 Total 60

Extra Grade:

10

Presentations:

5

Hardware Implementations:

5

(groups of maximum 4 Persons are allowed)

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Fundamentals of Electric Circuits EE201, by Dr. Omar Aly

Contents of the Course

Basic circuit elements and concepts.

Basic laws of circuit theory: Ohm's law,

Kirchoff's law.

Circuit theorems: superposition principle,

Thevenin and Norton theorems; maximum

power transfer theorem.

Techniques of circuit analysis: Nodal and

mesh analysis.

Sinusoidal sources and the concept of

phasor in circuit analysis.

Introduction to concept of active, reactive,

complex power and power factor.

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Fundamentals of Electric Circuits EE201, by Dr. Omar Aly

Introduction

An electric circuit is an interconnection of electrical

elements. Electric circuits range from very simple to

complicated circuits as shown. The purpose of this

course is to analyze these circuits.

Fundamentals of Electric Circuits, by Dr. Omar Aly

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SYSTEMS OF UNITS

Fundamentals of Electric Circuits, by Dr. Omar Aly

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POWER OF TEN NOTATION

Electrical values vary tremendously in size. In

electronic systems, for example, voltages may

range from a few millionths of a volt to several

thousand volts, while in power systems, voltages

of up to several hundred thousand are common.

To handle this large range, the power of ten

notation.

To express a number in power of ten notation,

move the decimal point to where you want it,

then multiply the result by the power of ten

needed to restore the number to its original

value.

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Fundamentals of Electric Circuits, by Dr. Omar Aly

EXAMPLE

247000 = 247000 =2.47 x

5

10

5 4 3 2 1

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Fundamentals of Electric Circuits, by Dr. Omar Aly

PREFIXES

Express the following in

engineering notation:

a. 10x104 volts b. 0.1x10-3 watts

c. 250x10-7 seconds

Solution

a. 10x104 V = 100x103V

= 100 kV

b. 0.1x10-3 W = 0.1 mW

c. 250x10-7 s = 25x 10-6 s

= 25 s

Fundamentals of Electric Circuits, by Dr. Omar Aly

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CHARGE AND CURRENT

Charge is an electrical property

of the atomic particles of which

matter consists, measured in

coulombs (C).

Electric current is the time rate

of change of charge, measured

in amperes (A).

A direct current (dc) is a current

that remains constant with time.

An alternating current (ac) is a

current that varies sinusoidally

with time.

Fundamentals of Electric Circuits, by Dr. Omar Aly

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VOLTAGE

Voltage (or potential difference) is the energy

required to move a unit charge through an

element, measured in volts (V).

where w is energy in joules (J)

vab = - vba

Like electric current, a constant voltage is called

a dc voltage and is represented by V, whereas a

sinusoidally time-varying voltage is called an ac

voltage and is represented by v.

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Fundamentals of Electric Circuits, by Dr. Omar Aly

POWER AND ENERGY

Power is the time rate of expending or absorbing

energy, measured...

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