SS1 First Term Computer Studies Lesson Note – Overview of Computer System

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WEEK ONE                                                             

TOPIC:  OVERVIEW OF COMPUTER SYSTEM

CONTENT: 

1. Definition of a Computer
2. Two main constituents of a Computer

SUBTOPIC 1: DEFINITION OF A COMPUTER

DEFINITION 1:

A Computer is an electronic device which under the control of a stored program can accept process, store, retrieve data and output the result as information in a specified form.

DEFINITION 2:

A Computer is an advanced electronic device that takes raw data as input from the user, processes these data under the control of set of instructions (called program), gives the result (output) and saves output for future use.

DEFINITION 3:

A Computer can be defined as a programmable electronic device designed for performing prescribed operations on data at high speed. It can also be linked to other devices for inputting, storing, retrieving, and output of information.

The three basic operations of the computer are:

Input (Data)

Input is the raw data entered into a computer from the input devices. It is the collection of letters, numbers, images etc.

Process

Process is the operation of data as per given instruction. It is totally internal process of the computer system.

Output

Output is the processed data given by computer after data processing. The output is known as Information. We can save these results in the storage devices for the future use.

Sub-Topic 2: CONSTITUENTS OF A COMPUTER SYSTEM:

A system is a set of connected parts forming a complex whole. Therefore, a computer system is a functional unit of interconnected parts or devices working together to achieve a common output.

It is made up of the CPU, memory and related electronics (main cabinet), all the peripheral devices connected to it and its operating system.

The computer system can be grouped into two namely:

1. Computer Hardware
2. Computer Software

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