Primary_Components_of_Computer_System_ics_part1_lec#02

 Primary_Components_of_Computer_System_ics part 1st lec#02

Primary Components of Computer System

            A computer system requires different components to perform the functions of input, processing output and storage.

computer environment figure blog no 2 lec no 2

1.     Input Devices

Anything given to the computer such as data or instructions is called input. Input devices are used to input data and instructions into the computer. These devices send this data to the processing unit. Most commonly used input devices are keyboard and Mouse

2.     Processing Device

The processor is used to process data. It is also called Central Processing Unit (CPU). It is the brain of the computer. It consists of electronic circuit. CPU interprets and executes program instructions.

All computers must have a central processing unit.

Main memory is used to hold data and instructions being executed by the CPU. It also holds the results of the processing. It keeps data and instructions temporarily. The main memory is closely connected to CPU but it is separated from it.

3.     Output Devices

The data processed into useful information is called output.

Output devices are used to display the result of processing. The most common output devices are Monitor and Printer.

4.    Storage Devices

Storage usually refers to the secondary storage. The storage devices are used to store data, programs and information permanently. The most common storage devices are hard disk drive, USB flash drive and optical discs such as CDs and DVDs etc.