Intro to IT


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Intro to IT

  1. 1. Information Technology Introduction to Computers
  2. 2. Introduction to Computers <ul><li>Definition Of Computers: </li></ul><ul><ul><li>“ The Word Computer is derived from the word “compute” which means to calculate. The computer, therefore, can be defined as a calculating device that can perform arithmetic and logical operations.” </li></ul></ul><ul><ul><li>“ Computer is defined as a device that accepts input, processes it and gives an output. </li></ul></ul>
  3. 3. Introduction to Computers Input Processing Output
  4. 4. Types of Computers <ul><li>Analog Computers </li></ul><ul><li>Digital Computers </li></ul><ul><li>Hybrid Computers </li></ul>
  5. 5. Analog Computers <ul><li>Analog computers are use to measure continuous values. </li></ul><ul><ul><li>Examples of analog computers are thermometers and analog clocks. </li></ul></ul>
  6. 6. Digital Computers <ul><li>Digital means discrete. With digital signals everything is described in two states either on or off , either 0 or 1. </li></ul><ul><ul><li>Examples of digital computers are digital watches and personal computers. </li></ul></ul>
  7. 7. Classification of Digital Computers <ul><li>Super Computers </li></ul><ul><li>Mainframe Computers </li></ul><ul><li>Mini Computers </li></ul><ul><li>Micro Computers/PC </li></ul>
  8. 8. Super Computers <ul><li>Super Computers are the largest, the fastest and the most expensive computers in the world. </li></ul><ul><li>They handle huge amounts of data and can perform more than one trillion calculations per second. </li></ul><ul><li>They are used in weather forecasting, and modeling complex processes like nuclear fission. </li></ul>
  9. 9. Mainframe Computers <ul><li>They are based on the principle of strong physical computing power. </li></ul><ul><li>They are sensitive to variations in temperature and environment. </li></ul><ul><li>They have a large storage capacity. </li></ul><ul><li>They can use a wide range of software. </li></ul>
  10. 10. Mini Computers <ul><li>They were introduced in the 60’s. </li></ul><ul><li>They have less capacity as compared to mainframes. </li></ul><ul><li>They provide facility of direct operation. </li></ul><ul><li>They were mainly used for data processing and in industry. </li></ul>
  11. 11. Micro Computers <ul><li>They are commonly used nowadays. </li></ul><ul><li>They are cheap and easy to use. </li></ul><ul><li>They have limited input and output capacity. </li></ul><ul><li>They are self-contained units and are to be used by one person. </li></ul>
  12. 12. Types of Micro Computers <ul><li>Desktop Computers </li></ul><ul><li>Laptop Computers </li></ul><ul><li>Palmtop Computers </li></ul>
  13. 13. Desktop Computers <ul><li>Single user machines. </li></ul><ul><li>They can fit on a desk. </li></ul><ul><li>They can be interconnected to form a network. </li></ul><ul><li>Their speed depends upon the processor. </li></ul><ul><li>They are cheaper and sold in millions. </li></ul>
  14. 14. Laptop Computers <ul><li>They are small, mobile personal computers that can fit in your lap. </li></ul><ul><li>They weigh from one to three Kg. </li></ul><ul><li>They are also called Notebooks. </li></ul><ul><li>They run on a battery or from an external AC/DC adapter that can charge the laptop or supply the computer by itself. </li></ul>
  15. 15. Palmtop Computers <ul><li>These are computing devices small enough to fit in your palm. </li></ul><ul><li>A Personal Digital Assistant is a popular type of a palmtop. </li></ul><ul><li>Palmtops are also known as handled PCs. </li></ul><ul><li>They are commonly used for taking notes, e-mails and telephony. </li></ul>
  16. 16. Hybrid Computers <ul><li>They are combinations of analog and digital computers. </li></ul><ul><li>They demonstrate qualities of both analog and digital computers. </li></ul><ul><li>An example is cement plants. </li></ul>