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Components of a computer

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—>>>What are the primary components of the computer?

  • Input devices
  • Central processing unit (containing the control unit & arithmetic/logical unit).
  • Memory.
  • Output devices.
  • Storage Devices.

—>>>Input Devices:-

  • Keyboard
  • Mouse
  • Joystick.


  • The most commonly used input device is the keyboard on which data is entered by manually keying in or typing certain keys. A keyboard typically has 101 or 110 keys.


  • The Mouse is a pointing device which is used to control the movement of a mouse pointer on the screen to make selections from the screen.
  • A mouse has one to five buttons. The bottom of the mouse is flat and contains a mechanism that detects movement of the mouse.

—>>>Central Processing Unit:-

  • The central processing unit (CPU) contains electronic circuits that cause processing to occur. The CPU interprets instructions to the computer, performs the logical and arithmetic processing operations, and causes the input and output operations to occur. It is considered the “brain” of the computer.


  • Memory also called Random Access Memory or RAM (temporary memory) is the main memory of the computer.
  • It consists of electronic components that store data including numbers, letters of the alphabet, graphics and sound. Any information stored in RAM is lost when the computer is turned off.
  • Read Only Memory or ROM is memory that is etched on a chip that has start-up directions for your computer. It is permanent memory.

—>>>Amount of RAM in Computers:-

  • The amount of memory in computers is typically measured in kilobytes (KB) or megabytes (MB) or gigabytes (GB).
  • 1 Byte = 8 bits
  • 1 KB = 1,000 Memory locations or 1024 Bytes
  • 1 MB = 1024 KB.
  • 1 GB = 1024 MB.
  • Therefore, a computer with 1 MB of memory can store approximately 1 million characters and can hold approximately 500 pages of text information.

Siddartha is a Blogger from India. He is currently working as a Java Front End developer and he loves writing about tutorials, technology, algorithm, etc. You can follow him on Twitter | Facebook | Google+. You can subscribe to GadgetCage RSS Feed or Email Notifications.

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