A computer is an electronic device used to carry out several complex tasks, such as managing large data, doing complex calculations, printing, controlling heavy machineries and complex protection system, etc. They are used in almost every field because of their high efficiency, almost zero possibility of an error and functional ease and excellence.

Short and Long Essay on Computer

Uses of Computer – Essay 1 (250 Words)

Introduction

Computer is a device that is used for several purposes like storing records and data, printing and performing other complex tasks. Their high level of usefulness has made computers being used in almost every office, schools and houses today.

Here are some of the fields where computers are used:

Hospitals

Hospitals have to keep several records. They have to keep records of their patients, their medical history, dates of the last visit, addresses, diagnosis, etc. They also have to maintain stock of medicines available and regularly update it. Maintaining such a huge data related to different subjects would be an impossible task if it is to be done manually. Computers, make this colossal looking job much easier by storing Gigabytes of information in its memory and reveal the information on a simple push of a button.

Schools and Offices

Computers are used in schools mainly for education purposes and for maintaining relevant data of students and staff, as well as in the offices for a wide range of purposes. Computers in schools contain all academic and personal records of the students. It contains everything from grades obtained to the contact number of the person in case of an emergency.

Railway Stations

Computer is also widely used in railway stations. They are used in operation of locomotives, through signals and systems, as well as for very basic yet important job of booking and printing tickets of the passengers.

Conclusion

Computers are widely used at almost every commercial location for their efficiency and ease of adaptability. Today any business would stand still without computers.


 

Components and Types of Computer – Essay 2 (400 Words)

Introduction

Computer is a machine that can carry out complex functions as per the instructions provided by humans. Their high efficiency and ability to perform any task has made them widely in use.

 

Components of Computer

Any computer mainly has three main components – Input (I/p) Device, the Central Processing Unit (CPU) and the Output (O/p) Device.

  • Input device is used to feed instructions to the computer. Keyboard, joysticks, touch pens are some of the examples of Input devices.
  • The Central Processing Unit is the brain of a computer. It consists of Arithmetic and Logic Unit (ALU) and the Memory Unit. ALU performs all the complex functions while the Memory Unit stores the data and information.
  • Output devices are used to display the output as desired by the user. Some of the most common output devices are monitors and printers, etc.

Types of Computer

Depending on their architecture, size, and performance, computers can be classified into different types as listed below-

  • Supercomputer

A supercomputer is a high-performance computer that performs much better than the general-purpose computer. Supercomputers require large spaces, often a big room or hall and an effective cooling mechanism to operate.

  • Mainframe Computer

Mainframe Computers are used by large organizations for critical applications such as bulk data processing, enterprise resource planning (ERP), census, etc. They are larger than personal computers and also have more processing power and speed as well.

  • Personal Computer

A personal computer is a computer used for personal use. Its unique size, capabilities, and price, makes it suitable to be used as a personal computer. Unlike, mainframe and supercomputers, personal computers are not shared and are solely operated by a single owner.

  • Laptop

A laptop is also a kind of personal computer, but unlike the conventional personal computer, the desktop, it is handy, portable and lightweight. It is easy to carry a laptop and it is so light that it could be placed comfortably on your lap.

  • Smartphone

Smartphone widely used today are also a kind of mobile computing device. These operate on their own operating systems; those provide them with a wide range of software adaptability and features like internet, web browsing, cameras, etc.

Conclusion

Modern-day computers are used in almost every industry depending on the requirements and needs. From supercomputers to laptops to smartphones, every device is useful in its own unique way and varies widely in price and specification.

 

History of Computer – Essay 3 (600 Words)

Introduction

Computer is an electronic device that is used to perform complex arithmetical and analytical functions much beyond the natural capacity of humans. Computers are highly efficient devices and perform really fast and accurate. Output generated by a computer is precise and there is no possibility for an error except human error.

History of Computer

The history of the computer is long and has many phases of development. Some consider that an early calculating device named ‘Abacus’ led further to the invention of calculator and computer. Though, the abacus was only a mechanical device consisting of wooden beads those can move on thin rods or wires. Even to this day ‘Abacus’ has retained its original form and doesn’t contain any electronic or electrical part.

  • The Difference Engine

The first-ever mechanical computer was developed by Charles Babbage, no earlier than 1822. This machine was called the ‘Difference Engine’. Charles Babbage is often referred to as ‘Father of the computer’ though; his invention was completely different from the modern-day computers.

  • The Analytical Engine

This machine was a proposal made by Charles Babbage in 1837. It contained ALU (Arithmetic and Logic Unit), flow control, punch card, and integrated memory. It was the first concept to make the general-purpose computer. But unfortunately, due to financial problems, this concept of Babbage, never materialized in his life span. However, his son Henry Babbage was able to develop a portion of the machine as conceptualized by Charles Babbage, no sooner than in 1910.

  • Z1 – The First Ever Programmable Computer

This computer was developed by a German inventor named Konrad Zuse. He developed it during 1936-1938, in his parents’ living room while he was around 26 years old. ‘Z1’ was the first binary programmable computer and the actual predecessor of modern-day computers.

  • The Turing Machine

This machine was proposed by Alan Turing in 1936. Turing was a mathematician and a computer scientist based in the United Kingdom. Turing machine was capable of simulating and algorithm and printing symbols on a paper tape.

  • The Colossus

The Colossus was a set of machines developed by the British during World War II. These were developed by the British code breakers, during 1943-1945 to read high-level messages of the German Army during the Second World War.

  • First Digital Computer

The first digital computer used plus 300 vacuum tubes and could perform mathematical calculations and Boolean logic. It was also called Atanasoff-Berry Computer (ABC Computer), after its two inventors John Vincent Atanasoff and Cliff Berry. They developed it from 1937-1942 at Iowa State College which is now Iowa State University.

  • First Electronic Computer (ENIAC)

ENIAC is an abbreviation of Electronic Numeric Integrator and Calculator, developed in 1943, at the University of Pennsylvania by J. Presper Eckert and John Mauchly. It was colossal, heavy and required 1800 square feet. It also used around 18,000 vacuum tubes and weighs approximately 50 tons. This was the first fully functional digital computer.

  • First Computer Company

The first computer company was founded in 1949 and it was named Electronics Control Company. It was founded by two persons who helped create the ENIAC – J. Presper Eckert and John Mauchly.

Conclusion

Modern computers have evolved through hundreds of years to reach the efficiency and shape that we see today. But, evolution is not over yet and will continue for centuries to come with the help of humans innovating to bring new technological advancements.