Chapter 1 our digital world
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Chapter 1 Our Digital World. 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 Our Digital World

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Chapter 1 our digital world

Chapter 1 Our Digital World

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

Digital

  • 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, 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

A computer is an electronic device that

  • operates under a set of instructions

  • accepts data that a user supplies

  • manipulates data according to a program

  • produces results

  • stores the results


The computer advantage

The Computer Advantage

Speed

  • 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 advantage1

The Computer Advantage

Accuracy

  • 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 advantage2

The Computer Advantage

Versatility

  • 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.


The computer advantage3

The Computer Advantage

Versatility

  • Banks conduct money transfers, account withdrawals, and payment of checks via computer.

  • Retailers process sales transactions and check availability of products.


The computer advantage4

The Computer Advantage

Versatility

  • Manufacturers manage their entire production, warehousing, and selling processes.

  • Schools keep records, conduct distance-learning classes, schedule events, and analyze budgets.


The computer advantage5

The Computer Advantage

Storage

  • 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 advantage6

The Computer Advantage

Communications

  • 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 advantage7

The Computer Advantage

Communications

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


The computer advantage8

The Computer Advantage

Communications

  • 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 advantage9

The Computer Advantage

Communications

  • 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 advantage10

The Computer Advantage

Communications

  • 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 advantage11

The Computer Advantage

Communications

  • 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 the Web site

  • Search engine – a software program that locates and retrieves requested information


The computer advantage12

The Computer Advantage

What advantages do computers offer?

  • They provide speed, versatility, storage, and communications.

  • They can be used in homes, the workplace, and society.

  • They can be 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

How Computers Work

During the information processing cycle, data is entered into a computer, processed, sent as output, and stored (if required for future use).


Computers and computer systems

Computers and Computer Systems

A personal computer system includes

  • The system unit

  • Input devices

  • Output devices

  • Storage devices

  • Communications devices


Components of a computer system

Components of a Computer System

Parts of a Personal Computer System

  • The system unit – the electronic components process data into info

  • Input devices – allow users to enter instructions, data, and commands into computers (keyboard, mouse, microphone)

  • Output devices – make information available to the user (display screen, printer)


Components of a computer system1

Components of a Computer System

Parts of a Personal Computer System

  • 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

Categories of Computers

Personal Computers

  • Fit on a desk, in a briefcase, or are worn

  • Execute 600 million to three billion instructions per second

  • Are used by a single user or as part of a network

  • Cost a few hundred to thousands of dollars


Categories of computers1

Categories of Computers

Handheld Computers

  • Fit in a hand or are carried in a pocket

  • Execute a few hundred instructions per second

  • Are used by a single user or as part of a network

  • Cost $99 to a few hundred dollars


Categories of computers2

Categories of Computers

Workstations

  • Are similar in size to desktop PCs

  • Execute three to five billion instructions per second

  • Are used by a single user or as part of a network

  • Cost a few thousand dollars


Categories of computers3

Categories of Computers

Midrange Servers

  • Fit into a large cabinet

  • Execute billions of instructions per second

  • Are used by hundreds of users at the same time

  • Cost $5,000 to hundreds of thousands of dollars


Categories of computers4

Categories of Computers

Large Servers or Mainframes

  • Occupy a full or partial room

  • Execute billions of instructions per second

  • Are used by hundreds of thousands of users at the same time

  • Cost several thousands to millions of dollars


Categories of computers5

Categories of Computers

Supercomputers

  • Occupy a full room

  • Execute trillions of instructions per second

  • Are used by thousands of users at the same time

  • Cost several million dollars


Categories of computers6

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?


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