A technological revolution is changing our ways of life, the way we live, work and play. Computer is changing the ways we communicate, do business and learn about the different branches of education. Knowledge is nowadays more accessible due to advancement in computer technology.
What is Computer?
Computer is defined as:
The “computer” is derived from the Latin word “compute”, which means to calculate. so a computer is normally considered to be a calculating device that can perform arithmetic and logical operations at a very fast speed.
A computer is an electronic device that can accept data, process it and give results after that processing.
Computer is an electronic machine which converts data into information.
Data are basic values or facts. A computer uses many different types of data store in digital format, such as text, numbers, and multimedia.
When information is entered into and stored in a computer, it is generally referred to as data.
Parts of computer
A Computer has four parts.
- CPU (Central Processing Unit)
CPU (Central Processing Unit)
CPU stands for central processing unit. It is the brain of computer. It is also called processor. A computer cannot work without CPU. Each CPU has a set of pins through which all its communication takes place with the other devices. Some pins are used to carry the output signals from the CPU consists of two units named ALU (Arithmetic and Logic Unit) and CU (Control Unit). CPU is located on the motherboard.
A monitor or display (sometimes called a visual display unit) is an electronic visual display for computers. The monitor comprises the display device, circuitry, and an enclosure. The size of a display is usually given as the distance between two opposite screen corners. Display screen varies in size from 5 to 30 inches. Monitor has five types as following:
- CRT (Cathode Ray Tube) Monitor
- LCD (Liquid Crystal Display) Monitor
- LED (Liquid Emitting Diode) Monitor
- OLED (Organic Liquid Emitting Diode) Monitor
- Plasma Monitor
The device used to enter data into the computer system is called input device. Keyboard is the set of typewriter-like keys that enables you to enter data into a computer. Computer keyboards are similar to electric-typewriter keyboards but contain additional keys.
There are few types of keyboards as below:
- Ergonomic Keyboard
- Compact Keyboards
- Internet Keyboards
- Multimedia and Gaming Keyboards
- Virtual Keyboards
The Mouse is a small device that when moved across a desktop, moves the graphics cursor accordingly. The graphics cursor which can be positioned anywhere on the screen is displayed as a bracket, an arrow, a crosshair or a variety of other symbols. Depending on the application, the text and graphics cursors may be displayed on the screen at the same time. the graphics cursor is used to point and draw. Nowadays 12 to 14 different types of mouse in the market.
But there are two basic types of mouse:
- Mechanical Mouse
- Optical Mouse