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

Immersed in Digital Technology refers to an electronic signal that is processed, sent, and stored as bits

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 Technology How has digital technology infiltrated your daily life?

Immersed in Digital Technology How has digital technology infiltrated your daily life? Computer technology powers HDTVs, VCRs, microwave ovens, watches, cell phones, and automobiles.

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 Technology Computerized devices have embedded computers to perform a few specific actions

Immersed in Digital Technology A computer is an electronic device that

Immersed in Digital Technology A computer is an electronic device that operates under a set of instructions

Immersed in Digital Technology A computer is an electronic device that operates under a set of instructions accepts data that user supplies

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

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

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 Advantage Speed Computers operate with lightning-like speed.

The Computer Advantage Speed Computers operate with lightning-like speed. PCs execute billions of program instructions in one second.

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 Advantage Accuracy

The Computer Advantage Accuracy Computers are accurate when accurate programs and data are entered.

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 Advantage Versatility

The Computer Advantage Versatility Families use computers for entertainment, communications, budgeting, online shopping, homework, playing games, and listening to music.

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

The Computer Advantage Versatility Retailers process sales transactions and check availability of products.

The Computer Advantage Versatility Retailers process sales transactions and check availability of products. Manufacturers manage their entire production, warehousing, and selling processes.

The Computer Advantage Versatility 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 Advantage Storage Computers accept and store programs and data.

The Computer Advantage Storage Computers accept and store programs and data. Users can access a program again and again to process different data.

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 Advantage Communications

The Computer Advantage Communications Networks using special equipment and programs allow computers to communicate with each other through telephone lines, cable connections, and satellites.

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 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 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 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 Advantage Communications The Internet is used for various purposes, including

The Computer Advantage Communications The Internet is used for various purposes, including sending and receiving messages

The Computer Advantage Communications The Internet is used for various purposes, including sending and receiving messages researching information

The Computer Advantage Communications The Internet is used for various purposes, including sending and receiving messages researching information buying and selling products and services

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

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 Advantage Communications

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

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 on a Web site

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 on a Web site Search engine – a software program that locates and retrieves requested information

The Computer Advantage What advantages do computers offer?

The Computer Advantage What advantages do computers offer? Provide speed, versatility, storage, and communications

The Computer Advantage What advantages do computers offer? Provide speed, versatility, storage, and communications Widely used in homes, workplace, and society

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 Types of data

How Computers Work Types of data Text data – letters, numbers, and special characters

How Computers Work Types of data Text data – letters, numbers, and special characters Graphic data – photographs, charts, and drawings

How Computers Work Types of data Text data – letters, numbers, and special characters Graphic data – photographs, charts, and drawings Audio data – voice and music

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

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 A personal computer system includes: System unit Input devices Output devices Storage devices Communications devices

Components of a Computer System A personal computer system includes:

Components of a Computer System A personal computer system includes: System unit – the electronic components process data into information

Components of a Computer System A personal computer system includes: System unit – the 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

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 System A personal computer system includes: Storage devices –provide for permanent storage of programs, data, and information

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

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.

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

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

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

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