By Keshuv Hookoom Introduction to Computers Chapter 1.1.1
Introduction of Computers
We are familiar with cars, telephones and television sets.
Some computers are used in many different kinds of work at offices, banks, hospitals, factories and schools.
Some computers are big. Others are small. A small computer is called a microcomputer or a micro for short. It is also popularly known as Personal Computer also known as PC.
The computer has become a modern tool in a modern society.
The computers are getting personal for word processing, graphic design, entertainment,etc.
How does a computer process data ?
The way a computer works is very similar to the way you solve a problem using pen and paper.
There are several process:
Input : obtaining the data
Processing : involves manipulation of data
Output : involves sending the results of the processing the information to the uses
Storage: involves keeping the data in an electronic store
Processing is done by a processor.
The processor is like the ‘brain’ of the computer.
The processor does it’s job executing a program
A program is a set of instructions for completing a job.
the results of the processing are sent to the output units such as printers and monitors.
Output is the result which is produced.
Information is the output which is summarized
Data is nit directly useful but the information is useful.
The arrows show how the data is moved from the input to the processor for processing and sent out as output or information. The processed data is saved into the storage and retrieved from it when needed.
Processor Data Input Storage Output
Computers are defined as processing machines.
Some people call them data processing or information processing machines.
Computers are automatic.
Once a computer has been programmed, it can carry out certain instruction by itself.
Computers are also capable of storing data, instructions and information.
You have a list of the ages of your classmates and you want to find their average age. Add all the numbers and divide it by 6.
Processor input output Names Age Mike 12 Peter 13 Ahmad 11 Jane 13 Jean 12 Pierre 12 Average Age 12.1 years
What can computer can do ?
Computers can store large amounts of data and can recall data when needed.
There are number of jobs that involve data processing such as generating electricity bills, telephone bills, payslips, examination transcripts, etc.
All these processing involve data in the form of text and numbers.
computers’ are capable of processing data even when the data is not in the form of texts or notes.
Both input and output are not numbers but they are in form of pictures or images.
Computers can be used to control traffic lights, airplanes and ships.
Computers are just like cars, washing machines and video cassette.
They cannot think for themselves.
Computers follow instruction.
They do not have emotions or feelings just like human beings.