What is a Computer?

A computer is an electronic machine.it is wonder of modern science. It has now become an essential part of modern life.A computer is used for storing, organizing and finding information.it is also used to do big mathematical calculations, control other machines and whatnot. Any computer has two parts: Hardware, Software. The mechanical and electronic parts are called hardware Software refers to the data or Programmes. Broadly Hardware includes CPU, Monitor, the Key board and the Mouse. CPU looks like a box.it has a Mother board, the Chip, the Cards and the Rams in it.Monitor works like a TV screen.

We can Communicate with the whole world through the Internet with the help of Computer.

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A electronic device that accepts input (data), then manipulates or processes data to produce output (information), and stores data.

                                                OR

A computer is an electronic device used to process data, converting the data into information that is useful to people.

Computer

Comparison Between Human & Computer

Computer’s Application

•        Offices, Books Publication

•        Data Analysis, Data Base Management

•        Graphics, Multimedia

•        CAM (Computer Aided Manufacture)

•        Project Management

•        Communication

•        Education, Medical Field

•        Airways and Railways Ticket Reservations

•        Industrial Control and Instrumentation

•        Military, Banks

•        Design and Research Work

•        Other Applications

Classification of Computers (according to size)

•    According to size and processing speed computers can be divided into following groups:

     Supercomputers

•        Processing power

•        Weather forecasting, human genome mapping

    Mainframe computers

•        Large number of users

•        Multiple processors with high I/O bandwidth

•        Corporate Data Warehouses, Web servers

       Minicomputers

•        Midsize, multiuser computer

•        Departmental computing, E911 Services, Factory Automation.

Computer Categories (cont

Workstations

•        Single-user computer

•        More processing power than PC

•        Scientific applications, CAD, graphics

       Microcomputers, or personal computers

•        Most common type of single-user computer

•        Includes notebook or laptop with docking station, desktop, tower, handheld PC such as a PDA, tablet

•        Web devices with internet connections

 Type of computer: based on purpose

•        Special-purpose computers is design for a scientific applications, also known as dedicated computers.

*  Permanently programmed to perform one major operation.

*   Uses: Traffic control, medical sciences, games etc.

•        General-purpose computers is used to handle variety of works.

* It works on stored program concept where a program containing a series of instructions is prepared for an application and temporarily stored in the memory.

Type of computer: based on signals

•Analog Computer:

I analog computers, the physical quantities such as temperature, pressure, acceleration, power, force etc are represented by electrical current or voltage signal.

Analog computers have many applications in scientific and industrial fields in stimulating various physical systems or automatically controlling industrial process.

Digital Computer:

a digital computer accepts discrete numbers as input and after performing the desired operations on these numbers, it produces discrete numbers as output.

Hybrid Computer:

This type of computer combines the feature of both analog and digital computers.

information that is useful to people

Computers Consist of Four Part