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4/7/2012

Learning Objectives
Lecture ONE

Introduction to Computers
Reference: Shelly Cashman, Discovering Computers 2011, Living In Digital World, International Thompson Publishing,

•Define the computer terms. •Describes 5 components of computer. •Discuss advantages and disadvantages using computers. •Distinguish between system software and application software. •Differentiate among types, sizes and function of computer in each categories. Describes computer users. Describes how society uses computers.

About The Computer
Why is a computer so powerful? What does a computer do?

What is a computer?

Chapter1 / slide 4

About The Computer

The Computer System
The electronic, electric & mechanical equipment or physical components that make up a computer

DEFINITION
A Computer is
An electronic machine Control instruction

The series of instruction or programs that tells the hardware how to perform tasks Chapter1 / slide 5 Chapter1 / slide 6

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Chapter 1

Introduction to Computers

Tasks Perform By Computer
produces results

The Information Processing Cycle

accept data

manipulate data

INPUT

PROCESS

OUTPUT

store data

link data

STORAGE
Chapter1 / slide 8

Chapter 1

Introduction to Computers

The Components of a Computer

The Characteristics of Computer

WHY IS COMPUTER SO POWERFUL?
INPUT devices Software PROCESS devices
(system unit)

Software

OUTPUT devices

Speed
COMM. devices

Communication Storage Accuracy
GIGO

Software

Reliability

STORAGE devices
Chapter1 / slide 9

Chapter1 / slide 10

The Advantages of Computer

The Advantages of Computer

Speed – computers do everything in fraction of seconds. They can perform complex calculations, recall stored information, transmit information from one location to another, and move objects around a computer screen almost instantaneously. Accuracy/ Consistency– computers carry out activities/ results the same way every time they repeating the same action. Chapter1 / slide 11

Storage– computers can store data with large volume, e.g. 250GB; and keep data for long period of time, e.g. 20 years. Reliability – with speed, consistency, and precise come reliability. You can depend on getting the same result again and again, you can count on computers and communications networks to be available and properly functioning when you need them. Low Failure rate

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The Advantages of Computer

Implications: Disadvantages/ Social and Ethical Issues

Communicate– computers can share data with other computer which located around the world or even out of space, using the network connection.

The threat to personal privacy posed by large databases and computer networks The hazards of high-tech crime and the difficulty of keeping data secure The difficulty of defining and protecting intellectual property in an all-digital age The risks of failure of computer systems The threat of automation and the dehumanization of work The abuse of information as a tool of political and economic power The dangers of dependence on complex technology Chapter1 / slide 14

Chapter 1

Computer Literacy & Information Literacy
What is computer literacy?

The Computer Software

To understand uses of computer and knowledge of computers

Why is information literacy?

Computer Software
Chapter1 / slide 16

Knows how to gather information, evaluate this information, and make an informed decision Chapter1 / slide 15

The Software

The Software

Operating System (OS) Utility Programs User Interface
Chapter1 / slide 17

Packaged Software Custom Software Freeware Public-domain Software Shareware Open Source Software Chapter1 / slide 18

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Software Forms

Software Forms

Packaged S/W is a mass produced, copyrighted retail software that meets the needs of a variety users. Custom S/W performs functions specific to a Business or industry. Open Source...
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