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Chapter 1. Our Digital World. Presentation Overview. Immersed in Digital Technology The Computer Advantage How Computers Work Computers and Computer Systems Components of a Computer System Categories of Computers. Immersed in Digital Technology. Digital

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Chapter 1

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Chapter 1

Our Digital World

presentation overview
Presentation Overview
  • Immersed in Digital Technology
  • The Computer Advantage
  • How Computers Work
  • Computers and Computer Systems
  • Components of a Computer System
  • Categories of Computers
immersed in digital technology
Immersed in Digital Technology


  • refers to an electronic signal that is processed, sent, and stored as bits
  • bits are represented by “on” and “off” states
immersed in digital technology1
Immersed in Digital Technology

How has digital technology infiltrated your daily life?

  • Computer technology powers HDTVs, VCRs, microwave ovens, watches, cell phones, and automobiles.
  • Embedded chips, computers, networks, and the Internet and WWW enable us to communicate globally.
immersed in digital technology2
Immersed in Digital Technology

Computerized devices

have embedded computers to perform a few specific actions

immersed in digital technology3
Immersed in Digital Technology

A computer is an electronic device that

  • operates under a set of instructions
  • accepts data that user supplies
  • manipulates data according to a program
  • produces results
  • stores the results
the computer advantage speed
The Computer AdvantageSpeed
  • Computers operate with lightning-like speed.
  • PCs execute billions of program instructions in one second.
  • Supercomputers execute trillions of instructions per second, the kind of processing required to forecast the weather and monitor space shuttle flights.
the computer advantage accuracy
The Computer AdvantageAccuracy
  • Computers are accurate when accurate programs and data are entered.
  • If inaccurate programs and/or data are entered (garbage in), the output will also be inaccurate (garbage out) – GIGO.
the computer advantage versatility
The Computer AdvantageVersatility
  • Families use computers for entertainment, communications, budgeting, online shopping, homework, playing games, and listening to music.
  • Universities, government agencies, hospitals, and scientific organizations conduct life-enhancing research using computers.
  • Banks conduct money transfers, account withdrawals, and payment of checks via computer.
the computer advantage versatility1
The Computer AdvantageVersatility
  • Retailers process sales transactions and check availability of products.
  • Manufacturers manage their entire production, warehousing, and selling processes.
  • Schools keep records, conduct distance-learning classes, schedule events, and analyze budgets.
the computer advantage storage
The Computer AdvantageStorage
  • Computers accept and store programs and data.
  • Users can access a program again and again to process different data.
  • Computers store huge amounts of data in tiny physical spaces.
the computer advantage communications
The Computer AdvantageCommunications
  • Networks using special equipment and programs allow computers to communicate with each other through telephone lines, cable connections, and satellites.
  • Users can exchange information over wireless networks using personal digital assistants (PDAs), notebook computers, cell phones, and pagers.
the computer advantage communications1
The Computer Advantage Communications

Alocal area network (LAN) is a network confined to a small geographic area, such as a building, factory, or college campus.

the computer advantage communications2
The Computer AdvantageCommunications

A wide area network (WAN)spans a large geographical area and might connect a company’s manufacturing plants dispersed throughout the United States.

the computer advantage communications3
The Computer AdvantageCommunications

The Internet is a worldwide network of large and small networks linked together via communications hardware, software, and media for the purpose of communicating and sharing information.

the computer advantage communications4
The Computer AdvantageCommunications

The Internet is used for various purposes, including

  • sending and receiving messages
  • researching information
  • buying and selling products and services
  • taking online college courses
  • accessing entertainment
the computer advantage communications5
The Computer AdvantageCommunications
  • World Wide Web – a system of linked computer networks that allows users to move from one site to another by way of links on Web pages
  • Web page – an electronic document stored on a computer running on a Web site
  • Search engine– a software program that locates and retrieves requested information
the computer advantage
The Computer Advantage

What advantages do computers offer?

  • Provide speed, versatility, storage, and communications
  • Widely used in homes, workplace, and society
  • Used to communicate, manage finances, analyze data, plan, research, and for hundreds of other purposes
how computers work
How Computers Work

Types of data

  • Text data – letters, numbers, and special characters
  • Graphic data – photographs, charts, and drawings
  • Audio data – voice and music
  • Video data – moving pictures and images
how computers work1
How Computers Work

Combining types of data can improve the presentation quality of a message.

how computers work2
During the information processing cycle, data is entered into a computer, processed, sent as output, and stored (if required for future use).How Computers Work
computers and computer systems
Computers and Computer Systems

A personal computer system includes:

  • System unit
  • Input devices
  • Output devices
  • Storage devices
  • Communications devices
components of a computer system
Components of a Computer System

A personal computer system includes:

  • System unit – electronic components process data into information
  • Input devices – allow users to enter instructions, data, and commands into a computer; common input devices:
    • keyboard , mouse, microphone
  • Output devices – make information available to the user; common output devices:
    • display screens, printers
components of a computer system1
Components of a Computer System

A personal computer system includes:

  • Storage devices – provide for permanent storage of programs, data, and information
  • Communications devices – allow a user to exchange instructions, data, and information with other computer users
components of a computer system2
Components of a Computer System

What is the difference between a computer and a computer system?

  • A computer is the part of the system that processes the data into information.
  • A computer system includes the computer along with input, output, storage, and communication devices.
categories of computers personal computers
Categories of Computers Personal Computers
  • fits on a desk, in a briefcase, on a laptop, or is worn
  • executes 600 million to 3 billion instructions per second
  • used by a single user or as part of a network
  • costs a few hundred to thousands of dollars
categories of computers handheld computer
Categories of Computers Handheld Computer
  • fits in hand(s) or carried in a pocket
  • executes a few hundred instructions per second
  • used by a single user or as part of a network
  • costs $99 to a few hundred dollars
categories of computers workstation
Categories of Computers Workstation
  • similar in size to desktop PC but larger and more powerful
  • executes 3 to 5 billion instructions per second
  • used by a single user or as part of a network
  • costs a few thousand dollars
categories of computers midrange server
Categories of ComputersMidrange Server
  • fits into a large cabinet
  • executes billions of instructions per second
  • used by hundreds of users at the same time
  • costs $5,000 to hundreds of thousands of dollars
categories of computers large server or mainframe
Categories of ComputersLarge Server or Mainframe
  • occupies a partial or full room
  • executes billions of instructions per second
  • used by hundreds or thousands of users at the same time
  • costs several thousands to millions of dollars
categories of computers supercomputer
Categories of ComputersSupercomputer
  • occupies a full room
  • executes trillions of instructions per second
  • used by thousands of users at the same time
  • costs several million dollars
categories of computers
Categories of Computers

What are the basic categories of computers and their distinguishing characteristics?

  • Personal computer – self-contained, capable of input, processing, output, and storage
  • Handheld computer – fits comfortably in a user’s hand
  • Workstation – high-performance single-user computer
on the horizon
On the Horizon

Based on the information presented in this chapter and your own experience, what do you think is on the horizon?