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MOTIVATION

&

BASIC CONCEPTS

EEE121

Electric Circuit Analysis -1

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Course Material

Textbook: Basic Engineering Circuit Analysis, 10th edition by J. David Irwin and R. Mark Nelms.

Reference 1: Electric Circuits, 9th edition by James

 W. Nilsson, Susan Riedel. Reference 2: Engineering circuit analysis, 6th 

edition by William Hayt , Jack Kemmerly.

My lecture notes will be quite rich.

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Marks Distribution

Sessional -1 10%

Sessional 2 15%

Quizzes 15%

 Assignments 10%

Final 50%

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Classifications of electrical systems

Communication systems

Computer systems

Control systems Power systems

Signal-processing systems

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Communication systems

Electrical systems that generate, transmit, anddistribute information.

examples

Television, Radio telescopes,

Satellite systems,

Radar systems,

Telephone systems.

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Computer systems

Use electric signals to process information rangingfrom word processing to mathematical computations.

Examples

pocket calculators personal computers

Supercomputers

They include networks of

microcircuits, assemblies ofhundreds, thousands, or

millions of electrical components

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Control systems

Use electric signals to regulate processes.

Examples Control of temperatures, pressures, and flow rates in an oil

refinery,

Cruise Control

The autopilot and auto landing systems

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Power systems

Generate and distribute electric power.

Major challenge is to provide sufficient redundancyand control.

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Signal-processing systems

 Act on electric signals that represent information.

Examples

Image-processing systems

CT (computerized tomography) scan

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 What is an Electric Circuit?

“An electric circuit is an interconnection of electricalcomponents”. 

Commonly used components;

Batteries, voltage sources, current sources, Resistors,

Switches,

Capacitors, inductors,

Diodes, transistors Operational amplifier

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 A Simple Electric Circuit

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System of Units

The International System of Units, or SystèmeInternational des Unités (SI), uses 7 base units.

 All other units are derived units e.g. frequency, force andpower.

S/N0 Quantity Basic Unit Symbol

1 Length Meter m

2 Mass Kilogram kg

3 Time Second s

4 Electric current Ampere A

5 Thermodynamic temperature Degree/Kelvin K

6 Amount of substance Mole mol

7 Luminous intensity Candela cd

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SI Standard Prefixes

Prefix Symbol Power

pico P 10−2 

nano N 10−9 

micro µ 10−6 

milli m 10−3 

centi c 10−2 

deci d 10− 

deka da 10 

hecto h 102

 Kilo k 10

3 

mega M 106 

giga G 109 

tera T 102