Introduction: Science has discovered many wonders and computer is one of them.It is an ultra modern electronic device for storing and analysing information fed into it.It has no capacity to do anything by itself.It works on the basis of commands given by the operator.
How invented: Computer was not invented over a night.First of all Pascal invented the theory of “Digital Calculating System” in 1942.Though his attempts were not crowned with Mr. Haward Akin, an american scientist invented such a machine in 1937 that can do difficult sums.So the credits for the invention of modern computer goes to Howard Akin.After seven years electric computer was used in Harvard University in 1944.After that many other computers have been invented such as EDSAC in 1945 and ENTANCE in 1946 etc.
Major components of a computer: A computer consists of five components.They are the input unit, the output unit ,the control unit, the memory unit , the arithmatic unit.
Function of a computer: A computer performs three functions :
1) it receives data,
2) it processes data by various computations,
3) it emits data
Machine language: Every computer has a machine language of its own and accordingly a computer functions. Machine language is not fixed.Its varies from machine to machine. Programmes written in machine language and they are only good for particular machine.
Uses of computer: Computer is a great use to us.it renders a great service to man kind.it is like ALADIN’S magic lamp or magic wand.It has lessened our work loads and made our life easy and comfortable.It is used our daily life for various purposes.
In education: computer is media of education in the developed countries.The students of developed countries use computer to prepare their study meterials.They learn many things within shortest possible time.Results of various examinations are prepared accurately with the help of computer within the shortest span of time.
In medical science: Now a days in developed countries computer is used to diagnose a disease.A newer process of operation has been invented by computer.It is used to grind stones in normal pathological tests.
In agriculture: Today computer is used in the field of agriculture in the developed countries . A farmer of USA simply puts on the switch of computer and gets everything done.
In commerce: Now a days business , commerce and trade can not be thought of without computer .It does wonder. It is used to prepare documents , to make lists of goods , store information and to prepare budget etc. The value of currency and price of any share can be known instantly by the computer.
In printing: Today printing can not be thought of without computer. It is an indispensable part of printing . Thousands of books are composed with the help of computer within a very short time.
In industrial sector: In the developed countries computer is used to run mills, factories and industries. Trains and planes are run by the computer.
Source of income: Computer is a source of great income . Many developed and advanced countries export software and hardware and earn a lot.
Demerits: There Is no unmixed blessings on earth. Everything has its dark sites. Computer has its own Demerits too. It causes diseases like respective stress injury and weakens the eye sight of the operators.
Computer in Bangladesh: Of late computer has been computer introduced in Bangladesh. Many Government and none govt. offices are using computer.A course on computer has been introduced in secondary levels.The day is not far to come when computer s will be used in every sphere of life.
Conclusion: Computer is of great use to us . We can not go a single day without computers. It is a part and parcel in our daily life.
Alternative Computer Essay:
Introduction: With the latest invention of modern science , our civilization is getting more development. The computer has been a great wonder of modern science. There is no denying the fact that the role of the computer in this modern age is inevitable. The inventor of the computer said, “no doubt, computer is an intrinsic congenial to the human exposure. “
What computer is: A computer is a collection of device that helps people perform mathematical calculations. It is regarded as a special kind of electronic machine that can perform mathematical calculations and process large amount of data as a great speed. In a few minutes , a computer can perform calculation that a trained mathematician would need years to do. Though a computer can perform many complex jobs at a tremendous speed, it had no capacity to do anything by itself . It works on the basis of commands given by the operator.
A substitute for human brain: We live in a age of science. Science plays the most vital role in modern civilization. Now it has raised human civilization up to the highest peak. So long, we are enjoying the benefits of cinema, radio, television, telegraph, telephone, X-ray and so on. But now we are enjoying the benefit of another wonderful invention of science. It is computer which has come forward to work as a substitute for human brain.
Invention of computer: A British professor of mathematics named Charles Babes deserved the credit for the invention of computer. He wrote about a formula which would human brain. According to his formula, he made a machine. As electronic parts did not come into use at that time, he used metallic parts. As a result, the machine did not function properly. Following the formula of Charles Babes, an American scientist named Howard Akin invented an improved computer. It could do difficult sums. But the most modern computer made with electronic parts does wonderful things. The history of the invention of computer is a chronicle of continuous assessment.
Kinds of computer: Computers are of three kinds – the Analogue, the Digital and the Hybrid. An Analogue Computer can solve the difficult problems of mathematics within a very short time . A digital Computer can do varieties of things . It not only keeps accounts but also finds out defects of other machines and it tells about its solution. Nowadays, a computer means a digital computer . And a hybrid computer works with the help of Digital and Analogue computer. It is also called a mixed computer.
The parts of computer : A computer has mainly three parts-
1. Central Processing Unit
2. Input devices like keyboard, mouse, joysticks, floppy disks, etc
3. Output device include printer, monitor, etc.
The Central Processing Unit is the brain of computer . The input part receives signals and the output part gives the result.
How it works: In a computer , the questions arranged though some signals and sent to the machine. This signaling is called a programme . Different programming languages are used in different computers . Programming plays a very important role in modernizing our thinking and thoughts . At first , the questions are sent to the receiver machine. The receiver machine then sends them to the preservation machine. Thousands of words and numbers are arranged in the preservation machine. They are the brain or memory of computer. The central machine carries out the directions of the preservation machine and finds out the solution. Finally, the result comes out of the output part of computer.
Uses of computer: Computer can be used in various sections. Really speaking, computer has a great influence on our everyday life. It has lessened our workloads and made our life easy and comfortable.
However, we are now using computers in the following fields :
In education: Computer plays an important role in the field of education. Many developed countries’ students use computer to prepare their study materials. They collect various information regarding their study though internet with the help of computer. In educational institution, most of the records are stored in computer.
In commerce: At present , business, commerce and trade cannot be thought of without the help of computer. In the business field, computer is used to prepare documents, to make lists of goods, store information and to prepare budget etc. In modern business , most of the communication is done though internet by computer .
In printing : The influence of computer in the field of printing is very great. Really speaking, printing and publication cannot be thought without computer.
In medical science: At present in many developed countries , computer is used to diagnose diseases . A newer process of operation has been invented by computer as an alternative to surgery.
Disadvantages: There are many disadvantages of computer .It sometimes submits embarrassing data and information directed by an evil brain . Sometimes, it used to degrade the prestige of a dignified person . The disadvantages don’t lie with computers ,but to human beings. It must be resisted.
Conclusion: Finally, it can be stated that computer is the greatest contribution of science . It will make the unemployment problem acute. In spite of this , we must welcome it. Regarding its beneficial contribution Howard Akin says, “computer invented not to create problems but to solve them has been treated as the dream machine “