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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