Introduction to computer_Lecture 1 of IICT course

INTRODUCTION TO COMPUTERS
Chapter 01

Objectives Overview
Explain why computer
literacy is vital to
success in today’s world
Define the term,
computer, and describe
the relationship
between data and
information
Describe the five
components of a
computer
Discuss the advantages
and disadvantages that
users experience when
working with
computers
Define the term,
network, and identify
benefits of sharing
resources on a network
Discuss the uses of the
Internet and World
Wide Web
2

Objectives Overview
Distinguish between system
software and application
software
Differentiate among types,
sizes, and functions of
computers in each category
Describe the role of each
element in an information
system
Explain how home users,
small office/home office
users, mobile users, power
users, and enterprise users
each interact with computers
Discuss how society uses
computers in education,
finance, government, health
care, science, publishing,
travel, and manufacturing

4
A World of Computers
• Computers are everywhere
Discovering Computers 2012: Chapter 1

What Is a Computer?
• A computer is an electronic device, operating under the control of instructions
stored in its own memory
Discovering Computers 2012: Chapter 1 5
Collects
data
(input)
Processing
Produces
information
(output)
Information Processing Cycle

6
What Is a Computer?
Page 6
Figure 1-2

7
The Components of a Computer
• A computer contains many electric, electronic, and mechanical
components known as hardware
Pages 6 - 8
• Allows you to enter data and instructions into a computer
Input Device
• Hardware component that conveys information to one or more people
Output Device
• Case that contains the electronic components of the computer that are used to process
data
System Unit
• Records (writes) and/or retrieves (reads) items to and from storage media
Storage Device
• Enables a computer to send and receive data, instructions, and information to and from
one or more computers or mobile devices
Communications Device

8
The Components of a Computer
Page 7
Figure 1-3

9
Advantages and Disadvantages
of Using Computers
Advantages of
Using Computers
Disadvantages of
Using Computers
Speed
Reliability
Consistency
Storage
Communications
Health Risks
Violation of Privacy
Public Safety
Impact on Labor Force
Impact on Environment
Pages 9 - 10

10
Advantages and Disadvantages
of Using Computers
• Green computing involves reducing the electricity consumed and
environmental waste generated when using a computer
• Strategies include:
– Recycling
– Regulating manufacturing processes
– Extending the life of computers
– Immediately donating or properly disposing of replaced computers
Page 10

Networks and the Internet
• A network is a collection of
computers and devices
connected together, often
wirelessly, via communications
devices and transmission
media
Pages 10 - 11
Figure 1-6

12
• The Internet is a worldwide collection of networks that connects
millions of businesses, government agencies, educational institutions,
and individuals
Page 11
Figure 1-7

13
• People use the Internet for a variety of reasons:
Pages 12 - 13
Figure 1-8
Communicate Research and
Access Information
Shop Bank and Invest Online Trading
Entertainment Download Videos Share Information Web Application

14
• A social networking Web site encourages members to share their interests, ideas,
stories, photos, music, and videos with other registered users
Page 14
Figure 1-9

Computer Software
• Software, also called a program, tells the computer what tasks to perform and how
to perform them
Pages 15 - 16
Figures 1-10 - 1-11
System Software
• Operating system
• Utility program
Application Software

16
Computer Software
• Installing is the process of setting up software to work with the computer, printer,
and other hardware
Pages 16 - 17
Figure 1-12

Computer Software
• A programmer develops
software or writes the
instructions that direct the
computer to process data into
information
Page 18
Figure 1-13

18
Categories of Computers
Embedded computers
Supercomputers
Mainframes
Servers
Game consoles
Mobile computers and mobile devices
Personal computers
Page 19

19
Personal Computers
• A personal computer can perform all of its input, processing, output, and storage
activities by itself
• Two popular architectures are the PC and the Apple
– Desktop computer
Pages 19 - 20
Figures 1-15 - 1-16

20
Mobile Computers and Mobile Devices
Personal computer you
can carry from place to
place
Examples include
notebook computers,
laptop computers,
netbooks, ultra-thins, and
Tablet PCs
Mobile
Computer
Computing device small
enough to hold in your
hand
Examples include smart
phones and PDAs, e-
book readers, handheld
computers, portable
media players, and
digital cameras
Mobile
Device
Pages 20 - 23

21
Notebook computer
Tablet PC
Smart phones and PDAs
E-book reader
Pages 20 - 22
Figures 1-17 – 1-20

22
Handheld computer
Portable media player
Digital camera
Pages 22 - 23
Figures 1-21 – 1-23

Game Consoles
• A game console is a mobile
computing device designed for
single-player or multiplayer
video games
Page 24
Figure 1-24

Servers
• A server controls access to the
hardware, software, and other
resources on a network
– Provides a centralized storage area
for programs, data, and
information
Page 25
Figure 1-25

Mainframes
• A mainframe is a large,
expensive, powerful computer
that can handle hundreds or
thousands of connected users
simultaneously
Page 25
Figure 1-26

26
Supercomputers
• A supercomputer is the fastest, most powerful computer
– Fastest supercomputers are capable of processing more than one quadrillion instructions in a
single second
Page 25
Figure 1-27

27
Embedded Computers
• An embedded computer is a special-purpose computer that functions as a
component in a larger product
Page 26
Consumer Electronics
• Mobile and digital
telephones
• Digital televisions
• Cameras
• Video recorders
• DVD players and
recorders
• Answering machines
Home Automation
Devices
• Thermostats
• Sprinkling systems
• Security monitoring
systems
• Appliances
• Lights
Automobiles
• Antilock brakes
• Engine control
modules
• Airbag controller
• Cruise control
Process Controllers
and Robotics
• Remote monitoring
systems
• Power monitors
• Machine controllers
• Medical devices
Computer Devices
and Office Machines
• Keyboards
• Printers
• Faxes
• Copiers

28
Embedded Computers
Page 26
Figure 1-28

29
Elements of an Information System
Hardware Software Data
People Procedures
Page 27

30
Elements of an Information System
Page 27
Figure 1-29

31
Examples of Computer Usage
Home User
• Personal financial management
• Web access
• Communications
• Entertainment
Small Office/Home Office User
• Look up information
• Send and receive e-mail messages
• Make telephone calls
Mobile User
• Connect to other computers on a
network or the Internet
• Transfer information
• Play video games
• Listen to music
• Watch movies
Pages 28 – 31
Figures 1-30 – 1-32

32
Examples of Computer Usage
Power User
• Work with multimedia
• Use industry-specific
software
Enterprise User
• Communicate among
employees
• Process high volumes of
transactions
• Blog
Pages 31 – 32
Figures 1-33 – 1-34

33
Computer Applications in Society
Education
Finance
Government
Health Care
Pages 34 - 36
Figures 1-36 – 1-39

34
Computer Applications in Society
Science
Publishing
Travel
Manufacturing
Pages 36 - 38
Figures 1-40 – 1-43

35
Summary
Basic computer
concepts
Components of a
computer
Networks, the Internet,
and computer software
Many different
categories of computers,
computer users, and
computer applications
in society
Page 39

Introduction to computer_Lecture 1 of IICT course

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