Perfect Computer Notes

There are five basic operations of a computer as follows: 1. Inputting It is the process of entering data and instructions into computer system. Input is performed by input devices like keyboard, mouse, scanner, digital camera and microphone etc. 2. Storing It is the process of saving data and instructions to make them available as and when required in future. Data and programs are stored on permanent storage devices, especially on hard disk. Other permanent storage media include CD - Compact Disk, DVD - Digital Video Disk and Zip Disk etc. 3. Processing It is the process of performing arithmetic and logical operations on data to convert them into useful information. Processing is performed by CPU- Central Processing Unit. CPU is also called Processor. It is the brain of computer. 4. Outputting It is the process of producing useful information after processing data, for example, printed reports for user. Output is presented by output devices like monitor, printe

Q. Write a note on Classification of Computers    OR Explain Types of computer on the basis of Size, Shape and Resources. OR How digital computers are classified? Classification of Computers Computers are classified on the basis of size, speed and price as under: •    Microcomputer or Personal Computer •    Mini Computer •    Mainframe Computer •    Super Computer 1. Micro Computers Desktop Model computer Micro computer is also called personal computer. It was introduced in 1970. It contains  input devices, output device, storage device, memory and processor. It is used by one person at a time. Examples of personal computers are PC and Apple Macintosh. The major types of personal computers are desktop computer and portable computer. Desktop Computers These computers can easily fit on a table or desktop, hence the name. These computers come in two models or casings. In Desktop model, the system unit is placed on the desktop or table. Monitor is placed on the system unit

Following are the main basic units or components of the computer : 1. Input Unit 2. Output Unit 3. Central Processing Unit( CPU / Processor) 4. Memory Unit 5. Storage Unit Diagram Showing Main Components or Basic Units of a Computer Different Basic Units or fundamental components of a computer Brief Description of Basic components of Computer 1. Input Unit Input unit consists of input devices . Input devices are used to enter data and instructions into computer memory. Examples of input devices are Keyboard, mouse, joystick and microphone etc. 2. Output Unit Output unit consists of output devices . Output devices are used to show results produced by computer after data processing. Examples of output devices are Monitor, Printer, plotter and  speaker etc. 3. Central Processing Unit Central processing unit is also called CPU or Processor . It is the brain of the computer. It performs data processing. It controls overall operations and