WHAT IS OPERATING SYSTEM?

ü  OS is system software, which may be viewed as collection of software consisting of procedures for operating the computer.

ü  It provides an environment for execution of programs (application software).

ü  It’s an interface between user & computer.

WHAT IS CPU?

•       The central processing unit or (CPU) is the "brain" of your computer. It contains the electronic circuits that cause the computer to follow instructions from memory.

•       The CPU contains three main parts, all housed in a single package (Chip):

–      Control Unit (CU)

–      Arithmetic Logic Unit (ALU)

–      Memory

WHAT IS SCANNER?

•       A scanner is a device used to copy an image off paper and convert it into a digital image, which can be saved as a computer file and stored on a hard drive.

•       Scanners can also use a special kind of technology called Optical Character Recognition (OCR) to read text from paper and save it as an editable document file .

WHAT IS PRINTER?

•       A printer is designed to output information from a computer onto a piece of paper.

•       There are three kinds of printers:

         dot matrix,     laser,      and     inkjet. 

WHAT IS MONITOR?

•       This is the television-like screen where the results of a computer's tasks are displayed.

•       Monitors come in all sizes, but most commonly they are either 15 or 17 inches

                (measured diagonally from one corner of the screen to the opposite corner). 

WHAT IS MOUSE?

•          Its a device that is used to control the computer.  A cable connects the mouse to the computer.

•          When the mouse is moved on a pad, called a mouse pad, the cursor on the screen moves.

•          A cursor is a small symbol displayed on the computer screen (normally a diagonal arrow that

             is used as a pointer) that shows you what the mouse is referencing on the screen.

WHAT IS KEYBOARD?

      •       The keyboard looks like a typewriter.

•       It contains all the letters of the alphabet, numbers and some special symbols.

•       It operates like a typewriter keypad, but instead of moving an arm, which strikes the paper, it sends an electronic impulse to the computer, which displays a character on the monitor.