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Computer Basics:
Computer is an electronic device, which is used for computing and processing the data. The word computer is derived from compute; meaning to calculate, thus it is a machine, which can operate at high speed. It has features of speed (perform tasks in nanoseconds), consistency (work without getting tired and with same speed and accuracy), versatility (perform various types of jobs), memory (stores information for a long period and can increase it as per need) but disadvantages of malfunction (like any machine subject to occasional breakdown), wrong output (cannot correct wrong instructions) and have no feelings.
Parts of a Computer
Computer consists of input, storage, output and processing unit, which are
Input Devices: They are used to input text or data to computer and they include
- Keyboard: It is like a typewriter keyboard with 101 keys
- Mouse: A pointing device used to position the pointer, to create graphics, for click and drag-and-drop. Ball or optical mouse is connected by PS/2 port or USB port to computer.
Output Devices: They are used to output soft or hard copy to the user and they include
- Monitor: It is similar to television giving a soft copy output. Earlier monochrome or Color CRT monitors were used but now LED & LCD.
- Printers: It produces hard copy output on paper and includes inkjet and laser printers.
- Storage Devices: They are used to store data for long periods and they include
- Hard Disk Drive: It is used for mass storage having 250-1024 GB capacity.
- Optical Disk: Laser beam stores data on disk and includes CD-ROM, DVD and blue ray.
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