1. Hassan Shabkat Abd Elfatah Mohamed Dakahlia Educational Directorate Mansoura Language Schools

2. Computer processor: it is hidden inside the system unit. It is particularly important part of the computer known as the central processing unit (CPU).

3. Computer memory; a RAM is a computer’s temporary storage place where it gets its work done.

4. Input devices: you communicate with the computer via an input device.

5. Keyboard: this is used to input data into a computer. With a keyboard, you can enter commands, select menu options and enter data into applications.

6. Mouse: the mouse is used in: pointing – selecting – drag and drop – open drop down menu.

7. Light pen: a special pen that lets you draw directly onto the screen, doing mouse functions.

8. Touch screen :similar to an ordinary computer monitor it has a thin, transparent layer of plastic covering it, that’s touch- sensitive. It has the same effect as if you clicked on that area with a mouse.

9. Joy stick: a hand- held stick that can be moved around in any direction used mainly for playing games.

10. Touch pad: often used on laptops. With a touchpad, you can move the cursor on the screen by touching the pad and moving your finger around. The two buttons, on the touchpad, simulate the use of the left and right buttons of a mouse.

11. Trackball: instead of using a mouse, you can use your thumb on the roller- ball to move the cursor on the screen.

12. Graphics pad: this is a square piece of material that you can use to draw pictures (for a mouse is not always practical for drawing complicated lines and shapes).

13. Scanner: used to scan images/documents into a computer. It can be hand- held, it is also used for optical character recognition (OCR) and to scan microfilm/ transparencies and negatives.

14. Output devices: the computer communicates its result to you via an output device.

15. Monitor: the screen/monitor/visual display unit is the part of the computer that displays the current process or application. There are several types of monitors.

16. Laser printer: these are large, expensive printers that work like a photocopier. They usually have very high quality printouts and can print very fast.

17. Inkjet printer: these are smaller, cheaper printers that use a little cartridge to spray a jet of ink onto the paper.

18. plotter;: this a special type of printer that draws pictures based on commands from a computer. They are used by engineers, advertisement personnel and designers who need to draw complicated diagrams.

19. Storage: a pc processes data in bits of streams of bits (the smallest component of computers data).

20. EquivalentSymbolSizeAbbreviati on Unit A single letter, number or symbol 8 bitsBByte A one- page double- spaced letter 1,024byteKBKilobyte A best- selling novel 1,024kilobyteMBMegabyte an encyclopedia set 1,024megabyt e GBGigabyte a bookstore1,024gigabyteTBTerabyte

21. Zip disk: can store 100 to 250 megabytes (MB) on a removable disk- about 70 to 170 times as much as an old floppy disk.

22. Zip drive: are available in both 100 MB and 250 MB.

23. Jaz disk: can store 1 to 2 gigabytes (GB).

24. Jaz drive: are also fast, though not as fast as a hard disk, so they are great for backing up information.

25. Tape drive: creates copies, or backups, of the files on a computer’s hard drive onto a tape cartridge. The baked up files can be restored in case the original files are lost due to a disaster or lake of experience.

26. Flash cards: are commonly used as the ‘film’ for digital cameras as well as computer portable storage. Flash cards can store anywhere from a dozen to several hundred pictures, depending on how much memory they have. There are three different types of flash cards: compact flash cards, smart media cards, and memory sticks. Flash cards can store anywhere from 4MB all the way up to 2 GB.

27. USB flash drive: is really another type of flash card that plugs into a USB port. USB flash drives range in sizes from 16MB to 4GB.

28. Hard drive or hard disk: is a computer ‘s main storage device. Most hard drives are tucked away in the system unit of a computer hidden from view; hard drives can usually be heard whirring inside when you start the computer. An external hard drive resides outside the computer’s system unit.

29. CD-ROM disks: CD-ROM- rom can hold more than 600 megabytes (MB) of data, most CD-ROMs can only read information. You can’t save, or record anything on them.

30. CD-ROM drive: used for read CD-ROM disks. CD-ROM stands for: Compact Disk-Read Only Memory

31. Floppy disk: some desktop computers still have a floppy drive, although some laptops have dropped the all-but-obsolete floppy drive. Floppy drives read flat, 3 ½ inch floppy disks. Floppy drives are as slow as molasses when compared to hard drives and CD- ROM drives. Floppy disks can only store 1.44 megabytes (MB) just a little more than your typical novel.

32. DVD: Digital Versatile Disks used to store data, can hold more than 4.7 GB.

33. What makes a computer powerful? Processor speed: a computer can do billions of actions per second

34. What makes a computer powerful? Reliability: failures are usually due to human error, one way or another.

35. What makes a computer powerful? Hard disk: a computer can keep huge amounts of data. The more bytes your hard disk has, the more data/software you can store.

36. What makes a computer powerful? Memory: the more memory your computer has, the more applications you can run at the same time. Increasing memory also improves system performance. Like a ballet dancer; the wider the space she has the better she can dance.