SSS One Notes in Computer Science

Senior Secondary School (SSS) One Lesson Notes in computer studies/ICT have been prepared on the following topics below

Computing Devices I (Pre-Computer Age to 19th Century)

Man has put every effort to have a better method of calculations. As a result of man’s search for fast and accurate calculating devices, the computer was developed.
19th Century Devices
Some of the 19th century devices are:
Abacus, Napier’s bones
Pascal’s calculator
Leibniz multiplier...

(20 Century to Date)Computing Devices II

20th century Devices are:
ENIAC
UNIVAC
EDVAC
EDSAC
Desktop
Laptop ...

Input Devices

Input device is any hardware component that allows a user to enter data and instructions into a computer.
Any peripheral used to provide data and control signals to a computer.
Without any input devices, a computer would only be a display device and not allow users to interact with it. Before computer processing, data must be entered into the computer by an input device so that they can be translated into machine-readable form...

Output Devices

Output devices are devices that enable the computer to communicate the results of data processing carried out by it to the user.
These devices enable the computer to display text, graphics and produce sound.
Examples of computer output devices
Theyinclude:
monitor
printer
speaker...

System Software

1. Computer software or simply software is a program that enables a computer to perform a specific task, as opposed to the physical component of the system (hardware).
2. Software is a set of instructions and procedures passed to the computer to perform certain activities or tasks.
3. It can also be defined as a set of instructions that direct the activities of the computer system to undertake a specific task....

Application Software

1. Application software is a program or group of programs designed for end users.

2. A program is called an application program if it performs some human-oriented task.
Types of Application Software
It is divided into two which are...

Programming Language

A computer programming language is an artificial language that can be used to control the behaviour of a machine, particularly a computer. Programming language is a means through which a programmer communicates with the computer in solving different categories of problems....

BASIC Programming Language

BASIC stands for Beginner’s All-purpose Symbolic Instruction Code. It was developed in 1960 by John Kemeny and Thomas Kurtz to teach students at Dartmouth College. It has undergone a series of historical development, which has resulted in several forms of the language ...

Communication System

ICT can therefore be defined as technologies that provide access to information through telecommunication. It is also defined as the use of a diverse set of technological tools and resources to communicate, create, disseminate, store and manage information...

Application Areas of ICT

ICT has different types of applications for different fields. These fields are explained below:
Teleconferencing
The word tele means distance. The word conference means discussion and consultation. It is simply defined as the process of holding a conference via telephone or network connection. Teleconferencing is the live exchange and mass circulation of information among several persons and machines remote from one another but linked by a telecommunication system...

Basic Computer Operations

1. Booting is defined as the processing of starting the computer.
2. Booting can also be defined as the initial set of operations that the computer performs when power is switched on...

Word Processing

Word Processing: Word processing means using the computer to create, edit, and print documents.
Word processor: A word processor is an electronic device or computer software application, which performs the task of composition, editing, formatting, and printing of documents.
Text Document: Text document is something written, printed, or online document that presents data in the form of an article, letter, memorandum, report, etc....

Presentation Packages

presentation program is a software package used to display information in the form of a slide show.
It has three major functions: an editor that allows text to be inserted and formatted, a method for inserting and manipulating graphic images, and a slide-show system to display the content...

Overview of Computer System

• Computer system can be defined as an electronic device which manipulates data and produces output using step-by-step instructions.
• A programmable machine that receives, stores, retrieves, processes and outputs data
• A computer may be defined as a machine that can solve problems by accepting data, performing certain operations and presenting the results of those operations under the direction of detailed step-by-step instructions...

Data and Information

Definition of Data
Data are raw facts. They are figures, words and symbols that have not been processed or put into meaningful form. Data can be referred to as raw material from which information is produced.
Types of Data
1. Quantitative Data
2. Qualitative Data...