A computer, also called a processor, is an electronic device designed to accept data, perform prescribed mathematical and logical operations at high speed, and display the results of these operations. The main job of a computer is to process data we put in, then either store it or release it as an output for us.
There are three main components of a computer; Hardware, which is the associated physical equipment directly involved in the performance of data-processing or communications functions, Software, which are the programs used to direct the operation of a computer, as well as documentation and Users, who are people that use the software on a computer for various tasks according to their needs.
There are various types of computers, but when one wants to buy a computer for individual use, they should buy a Personal computer (PC). A personal computer is a small computer that can be used independently by an individual user for word-processing, games, e-mail or storage of information. These computers are the kind for everyday use that can be set on a desk, they are very popular. Personal computers range in prices depending on storage and processing abilities and speed. The major components of a PC are:
-system unit (physical apparatus) which consist of the desktop (screen) and the tower (that contains the CPU, RAM, power supply, hard disks and all the slots for connecting all the other components).
- A series of input and output devices and peripherals.
Every pc has a central processing unit (CPU). A CPU is a chip called a microprocessor that鈥檚 job is to perform computer processing done by following the instructions of the software or programs to process data and produce information. Every PC has at least one CPU located on the motherboard, which connects all the parts of the computer together. A CPU is also divided into more main parts; ALU, registers or immediate access memory and Control unit. The Control unit directs electronic signals between the main memory and the input and output devices. Input devices allow one to put information into the computer. Some of the many input devices needed for a good computer are a keyboard, Mouse (either laser or ball), a trackball, a touchpad, a touch screen, a light pen, a scanner, a joystick, a microphone, disk drives (including CD-ROMs, DVD-ROMs, floppy disk), a Digital camera and a Video camera. Output devices allow you to view information on your PC or extract information from your PC. Some of the most important products needed in order to be able to see things on your computer screen to the best of your ability are VDU (video display units, or monitors). These monitors allow the work being done on the computer to be displayed, as well as the results of processing, displaying texts, graphics and image forms. The best type of monitor for your personal computer is a flat screen, or flat panel display. This type of monitor is most popular these days. The characteristics of these monitors are color, size and resolution. The more colors it has the better the clarity of the images on your PC will be. The bigger your screen is, the better you will be able to do your work (most screens currently are about 17鈥欌€?to 21鈥欌€?. The higher the resolution, the better quality and clarity of the display or screen will be. The LED Displays (light emitting diodes) is the light that turns on when you press the button to start the computer, this feature is also important in figuring out when there is a problem; the light will trigger a specific flicker showing the presence of an error. Another output device important for a good home computer is a printer. The kinds of printers vary, but the best kind of printer for a personal computer is the colored laser printer. This printer, though expensive, can produce a variety of images and texts. Speakers (or headphones) are another feature that is available for a PC in order for the user to be able to hear sounds. Yet another feature is the removable media devices used to transfer data or documents onto other devices. Examples of these devices are CD-writers, DVD-writers or USB- flash memory cards. Of the devices that are considered both input and output devices are modems and speech synthesizers. Modems are important for access to the internet, the World Wide Web, which connects users to people from all over the world. Each of these devices (both input and output) will allow you to use your personal computer to the best of its ability. It is also important that one buy a good brand name of each of these devices as well as the computer itself, in order to assure warranty and to have the best products available.|||i think that your document here does a good job of detailing what you can expect in any good computer. keep in mind who your audience is, the reader of this may not understand all the terms, you may want to consider rewording some of the more technical parts. for even more help, you may want to post this quesiton in the "education %26amp; reference" section.
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