1.3 Components of Computer System

Computer system is made up of a number of components. These are -

  • Input unit
  • Memory unit
  • Central Processing unit
  • Output unit


Input unit

This unit contains devices with the help of which we enter data into computer. This unit makes link between user and computer. The input devices translate the information into the form understandable by computer. Keyboard and mouse are two basic devices used for giving data or instruction to computer.

Memory Unit

The Memory Unit is the part of the computer that holds data and instructions for processing.Memory associated with the CPU is also called primary storage, primary memory, main storage, internal storage and main memory. Computer memory capacity is expressed in terms of Bytes.A group of 8 bits is called byte. A byte is the smallest unit which can represent a data item or a character. Higher capacity of computer memory is expressed as..

  • Kilobyte (KB) 1 KB = 1024 Bytes
  • Megabyte (MB) 1 MB = 1024 KB
  • GigaByte (GB) 1 GB = 1024 MB
  • TeraByte (TB 1 TB = 1024 GB
  • PetaByte (PB) 1 PB = 1024 TB