Training Computer:Parts of a computer

Parts of a computer
If you use a desktop computer, you may know already that there is no single party called "computer". A computer is actually a system of many parts working together. The physical parts, you can see and touch, are collectively material. (Software, on the other hand, refers to instructions or programs, say that the hardware what to do.)

The figure below shows the most common hardware in a desktop computer system. May your system look a little different, but it probably has more of these parties. A laptop has the same parties, but combines them into a single notebook-sized package.

System unit
The unit is at the heart of a computer system. Usually it is a rectangular box on or under your desk. In this area are numerous electronic information processing. The most important of these components is the central processing unit (CPU), or microprocessor, which acts as the "brain" of your computer. Another element is the random access memory (RAM), which temporarily stores information that uses CPU when the computer is turned on. Information stored in RAM is erased when the computer is off.

Almost all other parts of your computer connects to the unit using cables. The cables connect to specific ports (openings), usually on the back of the unit. Equipment that is not part of the unit is sometimes called
Storage
Your computer has one or more disk drives-devices that store information on a metal or hard plastic. The disc retains information even when your computer is off.

Hard Drive
From your computer hard drive stores information on a hard disk, a rigid tray or stack of trays with a magnetic surface. Because hard drives can contain large amounts of information, they serve as your primary computer storage medium, holding almost all your software and files. The hard disk is normally located inside the system unit.

CD and DVD
Almost all computers today are equipped with a CD or DVD-ROM, usually located on the front of the unit. CD players use lasers to read (recover) data from a CD, and many CD players can also write (record) data on CDs. If you have a recordable disk drive, you can store copies of your files to blank CDs. You can also use a CD-ROM drive to play music CDs on your computer.

DVD players can do anything that might CD, DVD read more. If you have a DVD player, you can watch movies on your computer. Many DVD players can record data on blank DVDs.

Tip
If you have a recordable CD or DVD, save periodically (copy) of your important files to CD or DVD. That way, if your hard drive does not always succeed, you will not lose your data.

Floppy Disk
Disk drives to store information on disks, also called disks or diskettes. Compared to CDs and DVDs, floppy disks can store only a small amount of data. They also recover more slowly and are more vulnerable to damage. For these reasons, floppy drives are less popular than they were, although some computers still include them.

Why disks "floppy"? Even if the outside is made of hard plastic, it's just the race. The disk inside is made of a thin, flexible vinyl material.

Mouse
A mouse is a small device used to point and select items on your computer screen. Although mice come in many forms, typical of the mouse looks like a real mouse. It's small, oblong, and connected to the unit by a long wire that looks like a tail. Some new mouse are wireless.

A mouse is usually two buttons: one main button (usually the left) and a secondary button. Many also have a mouse wheel between the two buttons, allowing you to scroll smoothly through screens of information.
When you move the mouse in hand, a pointer on the screen moves in the same direction. (The pointer appearance may change depending on where it is placed on your screen.) If you want to select an item, you point to the question and then click (press release), the main button. Point and click with your mouse is the main way of interacting with your computer. For more information, consult with your mouse.

Keyboard
A keyboard is used primarily to type text into your computer. As keys on a typewriter, he keys for letters and numbers, but it also has special keys:

The function keys, found on the top line, perform different functions depending on where they are used.

The keypad, located on the right side of most keyboards, you can enter numbers quickly.

The navigation buttons, such as keys, you can move your position in your document or Web page.

You can also use your keyboard to perform many of the same tasks you can achieve with a mouse. For more information, check with your keyboard.

Monitor
A monitor displays information in visual form, using text and graphics. The portion of the screen that displays information is called the screen. As a television screen, a computer screen can display or animated images.

There are essentially two types of monitors: CRT (cathode ray tube) monitors and LCD (liquid crystal display) monitors. Both types of produce sharp images, but LCD monitors have the advantage of being much thinner and lighter. CRT monitors, however, are generally more affordable.

Printer
A printer transfers data from a computer onto paper. You do not need a printer to use your computer, but having one lets you print e-mail, cards, invitations, announcements and other materials. Many people like to be able to print their own photos at home.

The two main types of printers are inkjet printers and laser printers. Inkjet printers are the most popular printers for the home. They can print black and white or color and can produce high quality photos when used with special paper. Laser printers are faster and generally better able to handle intensive use.

Loudspeakers
Loudspeakers are used to play sound. May they be integrated into the unit or in connection with the cables. Speakers allow you to listen to music and hear sound effects to your computer.

Modem
To connect your computer to the Internet, you need a modem. A modem is a device that sends and receives data over a phone line or high-speed cable. The modems are sometimes included in the unit, but higher speed modems are usually separate components.