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Ppt lesson 01 middle school


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Ppt lesson 01 middle school

  1. 1. Unit 1—Computer BasicsLesson 1Understanding Computers andComputer Literacy
  2. 2. Objectives  Discuss the history of computers.  Define the term computer and describe a computer system.  Describe the five computer classification categories.  Describe communications and networks.  Identify how we use computers and technology in our daily lives Computer Concepts BASICS - 2
  3. 3. Introducing Computers  Computers are considered one of the most important conventions of the 20th century.  Their widespread use affects us individually and as a society. Computer Concepts BASICS - 3
  4. 4. A Brief History of the Computer •The first computers were developed in the late 1940s and early 1950s. •In 1971, Dr. Ted Hoff developed the microprocessor. •Steve Jobs and Steve The IBM PC was Wozniak built the first introduced in 1981. Apple computer in 1976. Computer Concepts BASICS - 4
  5. 5. What Is a Computer?  A computer is an electronic device that  Receives data (input)  Processes the data it receives  Stores the data in memory or on some storage device, such as a disk or CD  Outputs information on a device, such as a monitor or printer Computer Concepts BASICS - 5
  6. 6. What Is a Computer System?  A computer system includes hardware, software, data, information, and people.  Hardware: The machine including the wires, transistors, and so on  Software: Instructions or programs that control the computer  Data: Text, numbers, sound, images, video  Information: Output  People: Users of the computer Computer Concepts BASICS - 6
  7. 7. What Makes a Computer SoPowerful?  Although computers perform only basic operations, they  Perform those functions very quickly  Produce accurate and reliable results  Store large amounts of data  Provide versatility through various applications  Share resources with other computers  Are becoming more powerful and easier to use Computer Concepts BASICS - 7
  8. 8. Classifying Computers  Two categories of computers:  Special purpose  Used to control devices, such as radar detection or a microwave oven  General purpose  Five categories based on size, function, cost, and performance Computer Concepts BASICS - 8
  9. 9. General-Purpose Computers  Desktop: Personal computer in which all components fit on or under a desk  Mobile: Personal computers, such as notebook computers and tablet PCs  Mid-range server: Used by medium- sized companies; generally supports hundreds of users Computer Concepts BASICS - 9
  10. 10. General-Purpose Computers(cont.)  Mainframes: Large, very expensive machines that can support thousands of users; used by large corporations  Supercomputers: Used for specialized operations requiring mathematical operations Computer Concepts BASICS - 10
  11. 11. Computer Software  Two basic types  Application: Performs specific tasks for users (example: word processing)  System: Software that controls the computer’s operating system (example: Microsoft Windows) Computer Concepts BASICS - 11
  12. 12. Electronic Communications Electronic communication is the technology that allows computers to talk to each other and to other devices. Computer Concepts BASICS - 12
  13. 13. Network Systems  A network consists of multiple computers connected to each other to share data and resources.  Data and software programs usually are stored on a central computer called a server.  When network computers are located in the same general area, such as the same building or a department, it is called a local area network. Computer Concepts BASICS - 13
  14. 14. The Internet  The Internet evolved from a government research project that enabled the military and scientists around the world to share information.  Today, it is the largest network in the world.  Millions of people use it daily.  It is a critical and valuable business tool used by businesses of all sizes. Computer Concepts BASICS - 14
  15. 15. Technology for Everyday Life  Examples of the ways in which our lives are affected by computers daily:  Electronic security systems  Games  Government research operations  Computerized appliances Computer Concepts BASICS - 15
  16. 16. Computers in Our Future  Computers of the future will be  Less expensive  More powerful  More people will work from home.  Wireless devices will be commonplace. Computer Concepts BASICS - 16