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Author Topic: PARTS OF COMPUTER  (Read 1066 times)

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October 27, 2010, 04:45:46 PM
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The parts of the computer

What you see when you look at a typical computer workstation is:

a Monitor -- looks like and basically is a TV screen and controls
a Keyboard -- like a typewriter but with many useful extra keys
a Mouse -- a palm-size gadget that rolls on a ball and has buttons on it
a Printer -- inkjet or laser-xerox miniature printing machine a microphone and speakers -- if you're lucky, not all machine have these
a pair of stereo Speakers, for multimedia systems (also sometimes a Microphone to speak into)
a miniature TV camera -- if you're very lucky; not yet common
the BOX -- contains the CPU microchip and all the really important components
« Last Edit: January 01, 1970, 04:00:00 AM by Guest »


November 29, 2010, 12:25:47 PM
Reply #1
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If you use a desktop computer, you might already know that there isn't any single part called the "computer." A computer is really a system of many parts working together. The physical parts, which you can see and touch, are collectively called hardware. (Software, on the other hand, refers to the instructions, or programs, that tell the hardware what to do.)

The illustration below shows the most common hardware in a desktop computer system. Your system may look a little different, but it probably has most of these parts. A laptop computer has similar parts but combines them into a single notebook-sized package.



Desktop computer system

Let's take a look at each of these parts.

System unit
The system unit is the core of a computer system. Usually it's a rectangular box placed on or underneath your desk. Inside this box are many electronic components that process information. The most important of these components is the central processing unit (CPU), or microprocessor, which acts as the "brain" of your computer. Another component is random access memory (RAM), which temporarily stores information that the CPU uses while the computer is on. The information stored in RAM is erased when the computer is turned off.

Almost every other part of your computer connects to the system unit using cables. The cables plug into specific ports (openings), typically on the back of the system unit. Hardware that is not part of the system unit is sometimes called a peripheral device or device.



System unit

Top of pageStorage
Your computer has one or more disk drives—devices that store information on a metal or plastic disk. The disk preserves the information even when your computer is turned off.

Hard disk drive
Your computer's hard disk drive stores information on a hard disk, a rigid platter or stack of platters with a magnetic surface. Because hard disks can hold massive amounts of information, they usually serve as your computer's primary means of storage, holding almost all of your programs and files. The hard disk drive is normally located inside the system unit.



Hard disk drive

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



CD

DVD drives can do everything that CD drives can, plus read DVDs. If you have a DVD drive, you can watch movies on your computer. Many DVD drives can record data onto blank DVDs.

Tip
If you have a recordable CD or DVD drive, periodically back up (copy) your important files to CDs or DVDs. That way, if your hard disk ever fails, you won't lose your data.

Floppy disk drive
Floppy disk drives store information on floppy disks, also called floppies or diskettes. Compared to CDs and DVDs, floppy disks can store only a small amount of data. They also retrieve information more slowly and are more prone to damage. For these reasons, floppy disk drives are less popular than they used to be, although some computers still include them.



Floppy disk

Why are floppy disks "floppy"? Even though the outside is made of hard plastic, that's just the sleeve. The disk inside is made of a thin, flexible vinyl material.

Top of pageMouse
A mouse is a small device used to point to and select items on your computer screen. Although mice come in many shapes, the typical mouse does look a bit like an actual mouse. It's small, oblong, and connected to the system unit by a long wire that resembles a tail. Some newer mice are wireless.



Mouse

A mouse usually has two buttons: a primary button (usually the left button) and a secondary button. Many mice also have a wheel between the two buttons, which allows you to scroll smoothly through screens of information.

 
When you move the mouse with your hand, a pointer on your screen moves in the same direction. (The pointer's appearance might change depending on where it's positioned on your screen.) When you want to select an item, you point to the item and then click (press and release) the primary button. Pointing and clicking with your mouse is the main way to interact with your computer. For more information, see Using your mouse.

Top of pageKeyboard
A keyboard is used mainly for typing text into your computer. Like the keyboard on a typewriter, it has keys for letters and numbers, but it also has special keys:

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

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

The navigation keys, such as the arrow keys, allow you to move your position within a document or webpage.



Keyboard

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

Top of pageMonitor
A monitor displays information in visual form, using text and graphics. The portion of the monitor that displays the information is called the screen. Like a television screen, a computer screen can show still or moving pictures.

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



LCD monitor (left); CRT monitor (right)

Top of pagePrinter
A printer transfers data from a computer onto paper. You don't need a printer to use your computer, but having one allows you to print e‑mail, cards, invitations, announcements, and other materials. Many people also like being 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 in black and white or in full color and can produce high-quality photographs when used with special paper. Laser printers are faster and generally better able to handle heavy use.



Inkjet printer (left); laser printer (right)

Top of pageSpeakers
Speakers are used to play sound. They may be built into the system unit or connected with cables. Speakers allow you to listen to music and hear sound effects from your computer.



Computer speakers

Top of pageModem
To connect your computer to the Internet, you need a modem. A modem is a device that sends and receives computer information over a telephone line or high-speed cable. Modems are sometimes built into the system unit, but higher-speed modems are usually separate components.



Modem
To connect your computer to the Internet, you need a modem. A modem is a device that sends and receives computer information over a telephone line or high-speed cable. Modems are sometimes built into the system unit, but higher-speed modems are usually separate components
« Last Edit: January 01, 1970, 04:00:00 AM by Guest »
August 02, 2011, 11:30:12 PM
Reply #2
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Quote from: "ammaraobsnl"
The parts of the computer

What you see when you look at a typical computer workstation is:

a Monitor -- looks like and basically is a TV screen and controls
a Keyboard -- like a typewriter but with many useful extra keys
a Mouse -- a palm-size gadget that rolls on a ball and has buttons on it
a Printer -- inkjet or laser-xerox miniature printing machine a microphone and speakers -- if you're lucky, not all machine have these
a pair of stereo Speakers, for multimedia systems (also sometimes a Microphone to speak into)
a miniature TV camera -- if you're very lucky; not yet common
the BOX -- contains the CPU microchip and all the really important components
thanku
« Last Edit: January 01, 1970, 04:00:00 AM by Guest »
August 26, 2011, 06:02:35 AM
Reply #3
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good to see the subject related discussions... :)
« Last Edit: January 01, 1970, 04:00:00 AM by Guest »
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