2. A computer is a machine that is used to store and process data electronically Computer Definition

3. Computer components SoftwareHardware

4. Hardware: - Pieces of equipment that make up a computer system. - These are the parts you can touch (although many parts are contained within the computer’s case).

6. 1+2 3 memory Brain 1+2

7. Input devices 3 Output devices Memory CPU 1+21+2 Computer

8. Computer hardware ? Output devices Input devices memory Central Processing Unit Cpu

10. Memoty (RAM)(ROM)

11. 1+2 Input devices 3 Output devices Memory CPU 1+21+2 Computer

13. AA Byte 11010011 Bit

14. : the amount of storage space needed to hold either a 1 or a 0 in memory (binary numbering ) This is the smallest unit of computer memory bit Equal to 8 bits, this is the amount of storage space needed to hold one character byte bytes1024Kilobyte(KB) 1024KBMegabyte(MB) 1024MBGigabyte(GB) 1024GBTerabyte(TB)

18. Touch screen Electronic board

22. Output device: The screen : CRT LCD Plasma

23. Plotter Speakers

25. Computer hardware ? Output devices Input devices memory Central Processing Unit Cpu)

26. Storage drives are used to store and transfer data files. After data is entered into a computer, is must be saved as a file to preserve its contents after the computer is switched off.

27. Hard disk: drive HDD Usually fixed inside the computer and stores large volumes of data, which can be accessed and retrieved quickly. A software application must also install files onto the hard disk drive in order to run. when the user requests its use the acess time of a HDD is measured in milliseconds(msec)

28. Floppy disk drive: A floppy disk drive is like a hard disk, but with removable disks called floppies, floppy disks or diskettes. Floppies can be used to transfer small files from one PC to another (up to 1.4MB) CD-ROM/DVD-ROM Drive: CD-ROM (Compact Disk – Read Only Memory) CD-ROM -> CD-R -> CD-RW -> DVD -> DVD-R

29. AA Byte 11010011 Bit

30. : the amount of storage space needed to hold either a 1 or a 0 in memory (binary numbering ).This is the smallest unit of computer memory bit Equal to 8 bits, this is the amount of storage space needed to hold one character byte bytes1024Kilobyte(KB) 1024KBMegabyte(MB) 1024MBGigabyte(GB) 1024TBTerabyte

31. Computer components SoftwareHardware

33. Operating Systems software : is the software that runs the computer Microsoft Windows is the operating system a lot of people use. However, there are other forms of systems software such as Unix, Linux, OS2, BeOS, OS-X (MacOS) and so on Operating system cannot run without the BIOS

34. Common Applications Software Word Processing: Example Microsoft Word Spreadsheets:. Example Microsoft Excel Database: Examples Microsoft Access Presentation: Example Microsoft PowerPoint Web browsing Applications Software must be compatible with the Operating Systems

35. (Sheet 1) Sara Turn on her computer and then open the word processor to write her homework : What are the steps taken by the computer to do this task in order: Load MS word intothe RAM Run the BIOS software from the ROM the BIOS crries out the Power On Self Test(POST) read the OS files from HDD and copy them to the RAM 1 2 3 4

37. Types of computer (PC): 1- Personal Computer Typical users Cost SpeedCapacity ??? ?

38. 2- Network Compute : Typical users Cost SpeedCapacity ??? ?

39. 3-laptop computers: Typical users Cost SpeedCapacity ??? ?

40. 4-PDA: Typical users Cost SpeedCapacity ??? ?

41. 5-Mainframe Typical users Cost SpeedCapacity ??? ?

44. two or more computers connected together is called a network

46. Local Area Network(LAN) Wide Area Network(WAN) less than one square kilometre is a LAN While any network covering more than one square kilometre is WAN.

47. Client / server Networks

49. Internet Interanets