NEW FOLDER Gjpa /Nghy;lh;

COMPUTER AN INTERVIEW: A Computer is an Electronic Machine, which is capable of receiving data as INPUT and PROCESS the given data by programs and gives the OUTPUT result as useful information. It helps us to do our work with easy & makes our life easy. Computer is used to play games, write letters, do calculations, draw, etc.,

PARTS OF THE COMPUTER CPU - CENTRAL PROCESSING UNIT VDU (MONITOR)- VISUAL DISPLAY UNIT KEYBOARD MOUSE UPS- UNINTERRUPTED POWER SUPPLY PRINTER SPEAKER JOYSTICK

1.INPUT UNIT 2.PROCESSING UNIT (CPU) 3.OUTPUT UNIT The computer parts can be grouped as three units:-

COMPUTER INPUT UNIT To get data and instruction from the user and transmit them into computer memory. Ex- Keyboard, Mouse. PROCESSING UNIT (CPU) It is the heart of the computer. It consists of 1.Memory Unit 2.ALU (Arithmetic & Logic Unit) 3.Control Unit. OUTPUT UNIT To get the output result from the memory and give it to the user in human readable form. Ex-Monitor, Printer, Speaker.

Arithmetic and Logic Unit Control Unit Auxiliary memory Main Memory Input UnitOutput Unit CPU

1.MEMORY UNIT This unit stores data and instructions. 2.ALU (Arithmetic and Logic Unit) It does all arithmetic (addition, subtraction, multiplication, division) and Logical operation (comparison of data). 3.CONTROL UNIT It is the supervisor of all the other unit. Main function are GGive command to transfer data from the input device to the memory and from memory to ALU. TTransfer the results from memory to the output device. SStores the program in memory. Take instruction one by one from memory, understand and give command to other units.

MEMORY P rimary / Main Memory The memory unit of a computer is called Primary / Main Memory. Data, instructions and programs are stored in this memory in binary form. Information stored in this memory can be erased and rewritten. Information stored in main memory are directly processed by the computer at a very great speed. It is volatile memory. The memory capacity is limited. S econdary Memory The primary memory of a computer is limited and also volatile. So, we need secondary memories like floppy disk or hard disk. We can store large amount of information in secondary memory. Information stored in this memory are permanent. They can be got back any time.

Units of Measurements of Memory Bit Bit means Binary digIT. It is either the digit 0 (OFF state) or the digit 1 (ON state). Data and instruction are stored in memory as a combination of 0’s and 1’s. 0,1-Each one bit 8 bits-1 Byte 1024 Bytes-1 Kilo Byte (KB) 1024 KB-1 Mega Byte (MB) 1024 MB-1 Giga Byte (GB)

Various Semi-Conductor Memories RAM RAM means Random Access Memory. It is also known as read and write memory. Information stored in this memory can be erased and rewritten. It is a volatile memory. This memory lost when power goes off. ROM ROM means Read Only Memory. It is non-volatile memory. Information stored in this memory are not lost when the power goes off. Writing into ROM is done only once.

OPERATING SYSTEM (OS) DEFINITION Operating system is a collection of programs which controls the activities of the computer. It is stored in the Hard Disk / Floppy Disk. It is loaded into the memory when the power is switch ON. Without operating system, no can do any work on the computer. Examples- DOS, WINDOWS, LINUX, UNIX. windows,

WINDOWS Windows is an operating system. It is useful for maintaining and managing user files. Today most of the softwares are developed for windows operating system. The various versions of windows are  Windows 3.1  Windows 95  Windows 98  Windows ME (Millennium Edition)  Windows XP (Experience)  Windows Vista

DESKTOP TASKBAR ICONS START MENU

APPLICATION WINDOW TITLE BAR MENU BAR TOOL BAR SCROLL BAR STATUS BAR MAXIMIZE CLOSE MINIMIZE

TITLE BAR It contains the title of the application document. TOOL BAR It contains the tools. MENU BAR It contains menus. Each menu contains a list of commands. SCROLL BAR It has arrow buttons to move through a document left or right, up or down. STATUS BAR It has the current page details.

WINDOWS SHORTCUT KEYS 1.WINDOW + E-Open My Computer 2.F1-Help topic 3.ALT + F4-Close the window 4.ALT + Space bar + X-Maximize the window 5.ALT + Space bar + N-Minimize the window 6.ALT + Space bar + R-Restore the window 7.ALT + Space bar + S-Arrange the window size 8.ALT + Space bar + M-Move the window 9.ALT + Space bar + C-Close the window 10.WINDOW + D-To see the desktop 11.WINDOW + F-Search 12.ALT + TAB-Cycling action on the taskbar 13.WINDOW + Break-To see system properties 14.Shift + F10-Right Click option 15.F5-Refresh

Create New Folder RIGHT CLICK in any empty place Then click, N EW Then click, F OLDER

Rename the Folder Right click on the folder Then click, Rename Right click on the folder Then click, Delete Delete the Folder

TO CREATE NEW FOLDER Gjpa /Nghy;liu cUthf;f right click in any empty place ntw;wplj;jpy; itj;J iul; fpspf; nra;aTk;