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Computer application 1 Notes

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CHAPTER ONE.
INTRODUCTION
Definition : A Computer is an electronic device that can perform activities that involve
Mathematical,
Logical and graphical manipulations. Generally, the term is used to describe a collection of
devices that function together as a system.
It performs the following three operations in sequence.
1. It receives data & instructions from the input device.
2. Processes the data as per instructions.
3. Provides the result (output) in a desired form.
Data : It is the collection of raw facts, figures & symbols.
Ex : Names of students and their marks in different subjects listed in random order.
Information : It is the data that is processed & presented in an organized manner.
Ex : When the names of students are arranged in alphabetical order, total and average marks are
calculated & presented in a tabular form, it is information.
Program : Set of instructions that enables a computer to perform a given task.
Advantages of computers :
1. High speed : Computers have the ability to perform routine tasks at a greater speed than
human beings. They can perform millions of calculations in seconds.
2. Accuracy : Computers are used to perform tasks in a way that ensures accuracy.
3. Storage : Computers can store large amount of information. Any item of data or any
instruction stored in the memory can be retrieved by the computer at lightning speeds.
4. Automation : Computers can be instructed to perform complex tasks automatically ( which
increases the productivity).
5. Diligence : Computers can perform the same task repeatedly & with the same accuracy
without getting tired.
6. Versatility : Computers are flexible to perform both simple and complex tasks.
7. Cost effectiveness : Computers reduce the amount of paper work and human effort, thereby
reducing costs.
Limitations of computers :
1. Computers need clear & complete instructions to perform a task accurately. If the instructions
are not clear & complete, the computer will not produce the required result.
2. Computers cannot think.
3. Computers cannot learn by experience

Description

Updated notes for computer application 1.The notes are suitable for ICT certificate course and other certificate courses

Table of Contents
CHAPTER ONE. …………………………………………………………………………………………………………………………….7
INTRODUCTION……………………………………………………………………………………………………………………………7
Limitations of computers :…………………………………………………………………………………………………………7
Generations of computers :……………………………………………………………………………………………………….7
ANATOMY OF COMPUTERS ……………………………………………………………………………………………………….8
MEMORY OF THE COMPUTER…………………………………………………………………………………………………..10
CHAPTER TWO …………………………………………………………………………………………………………………………..14
HARDWARE AND SOFTWARE……………………………………………………………………………………………………14
Data Analysis………………………………………………………………………………………………………………………….15
Functions of Operating System:………………………………………………………………………………………………..16
Classification of Computers……………………………………………………………………………………………………..16
PERSONAL COMPUTERS…………………………………………………………………………………………………………..17
Working with personal computers ………………………………………………………………………………………..18
CHAPTER THREE…………………………………………………………………………………………………………………………19
MS-DOS …………………………………………………………………………………………………………………………………19
Files and File names………………………………………………………………………………………………………………..19
Types of files in DOS………………………………………………………………………………………………………………..19
Types of DOS commands…………………………………………………………………………………………………………20
Some of the useful commands: ………………………………………………………………………………………………..21
Computer viruses and Vaccines:……………………………………………………………………………………………….21
CHAPTER FOUR ………………………………………………………………………………………………………………………….24
WINDOWS…………………………………………………………………………………………………………………………………24
Features of Windows Operating System: …………………………………………………………………………………..24
Hardware required for Windows:……………………………………………………………………………………………..24
Parts of a window screen:………………………………………………………………………………………………………..24
Components of the Desktop:……………………………………………………………………………………………………24
Anatomy of a Window: ……………………………………………………………………………………………………………25
Booting in Windows………………………………………………………………………………………………………………..26
WINDOWS EXPLORER …………………………………………………………………………………………………………………26
Working with Folders………………………………………………………………………………………………………………26
Creating a Folder……………………………………………………………………………………………………………….