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What is computer Introduction to Computing

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Computers make it easier to do a lot of things, but most of the things they make it easier to do don't need to be done.

Computers are useless. They can only give you answers.

Published in: Technology

What is computer Introduction to Computing

  1. 1. Living in a Digital World Discovering Computers 2010 Ahmad Idrees
  2. 2. A World of Computers • Computers are everywhere 2Ahmad Idrees
  3. 3. What Is a Computer? • A computer is an electronic device, operating under the control of instructions stored in its own memory 3Page 6 Information Processing Cycle
  4. 4. What Is a Computer? 4Page 6 Figure 1-2
  5. 5. The Components of a Computer 5Pages 6 - 8
  6. 6. The Components of a Computer 6Page 7 Figure 1-3
  7. 7. The Components of a Computer What is an input device?  Hardware used to enter data and instructions into a computer e.g, keyboard, mouse, microphone, scanner and web cam etc. 7
  8. 8. The Components of a Computer What is an output device?  Hardware that conveys information to one or more people e.g. printer, monitor and speakers etc. 8
  9. 9. The Components of a Computer What is the system unit?  Case containing Electronic components used to process data. 9
  10. 10. The Components of a Computer What are two main components on the motherboard? Central Processing Unit (CPU)Central Processing Unit (CPU) Also called a processor. The electronic component that interprets and carries out the basic instructions that operate the computer. MemoryMemory Consists of electronic components that store instructions waiting to be executed and data needed by those instructions 10
  11. 11. The Components of a Computer What is storage? Storage mediaStorage media Physical material on which data, instructions, and information are stored e.g. USB flash drive, hard disks, optical discs and memory cards.. Storage mediaStorage media Physical material on which data, instructions, and information are stored e.g. USB flash drive, hard disks, optical discs and memory cards..  Holds data, instructions, and information for future use 11
  12. 12. The Components of a Computer What is a USB flash drive?  Provides much greater storage capacity than a floppy disk  Portable storage device small and lightweight enough to be transported on a keychain or in a pocket. 12
  13. 13. The Components of a Computer What is a hard disk?  Provides greater storage capacity than a floppy disk or USB flash drive  Most are housed inside of the system unit 13
  14. 14. The Components of a Computer What is a optical disc?  Flat, round, portable metal disc e.g. CDs, DVDs. 14
  15. 15. The Components of a Computer What is a communications device?  Hardware component that enables a computer to send and receive data, instructions and information  Occurs over cables, telephone lines, cellular networks, satellites, and other transmission media 15
  16. 16. Computer Applications in Society 16
  17. 17. Computer Applications in Society 17
  18. 18. Advantages and Disadvantages of Using Computers Advantages of Using Computers Disadvantages of Using Computers 18
  19. 19. 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 19
  20. 20. Networks and the Internet • A network is a collection of computers and devices connected together through transmission media. 20
  21. 21. To shareTo share Networks and the Internet What are the reasons to network? ResourcesResources Hardware devices Hardware devices Software programs Software programs DataData To save time and money To save time and money InformationInformation 21
  22. 22. Networks and the Internet What is a server?  A server manages the resources on a network  Clients access the resources on the server 22
  23. 23. Networks and the Internet What is the Internet?  Worldwide collection of networks that connects millions of businesses, government agencies, educational institutions, and individuals 23
  24. 24. Networks and the Internet What is the Web? A Web site is a collection of related Web pages A Web site is a collection of related Web pages A Web page contains text, graphics, sound, video, and links to other Web pages A Web page contains text, graphics, sound, video, and links to other Web pages You can share information by creating Web pages or posting photos on a photo sharing community You can share information by creating Web pages or posting photos on a photo sharing community  Billions of documents, called Web pages, available to anyone connected to the Internet 24
  25. 25. Networks and the Internet • People use the Internet for a variety of reasons: 25
  26. 26. Computer Software • Software, also called a program,consists of series of instructions that tells the computer what tasks to perform and how to perform them 26
  27. 27. Computer Software What is system software? Operating System (OS)Operating System (OS) is a set of programs that coordinates all activities among computer hardware devices and allows users to run application software Operating System (OS)Operating System (OS) is a set of programs that coordinates all activities among computer hardware devices and allows users to run application software Utility ProgramsUtility Programs allow the user to perform maintenance-type tasks usually related to managing a computer, its devices or its programs Utility ProgramsUtility Programs allow the user to perform maintenance-type tasks usually related to managing a computer, its devices or its programs  Programs that control or maintain the operations of the computer and its devices 27
  28. 28. Computer Software What is application software? Presentation Graphics Spreadsheet Database Word Processing  Programs that perform specific tasks for users 28
  29. 29. Computer Software • A programmer develops software or writes the instructions that direct the computer to process data into information 29
  30. 30. Categories of Computers 30
  31. 31. 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 31
  32. 32. Mobile Computers and Mobile Devices 32
  33. 33. Mobile Computers and Mobile Devices 33
  34. 34. Mobile Computers and Mobile Devices 34
  35. 35. Game Consoles • A game console is a mobile computing device designed for single-player or multiplayer video games 35
  36. 36. 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 36
  37. 37. Mainframes • A mainframe is a large, expensive, powerful computer that can handle hundreds or thousands of connected users simultaneously 37
  38. 38. Supercomputers • A supercomputer is the fastest, most powerful computer – Fastest supercomputers are capable of processing more than one quadrillion instructions in a single second 38
  39. 39. Embedded Computers • An embedded computer is a special-purpose computer that functions as a component in a larger product 39
  40. 40. Embedded Computers 40
  41. 41. Elements of an Information System 41
  42. 42. Elements of an Information System 42
  43. 43. Summary 43

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