system components

2. Input unit
Processing unit
Output unit

4. KEY BOARD
MOUSE
LIGHT PEN
JOY STICK
TRACK BALL
GRAPHICS TABLET
SCANNER
DIGITAL CAMERA
MAGNETIC INK CHARACTER READER
OPTICAL CHARACER READER
OPTICAL MARK READER
BAR CODE READER
TOUCH SCREEN
MICRO PHONE

5. IT TAKES INPUT FROM THE KEYS PRESENT ON
IT& CONVERTS INTO BINARY FORM ,FOR THE
COMPUTER THEN THE COMPUTER USES THE
BINARY DIGITS TO GIVE OUTPUT.
THE COMMONLY UDED INPUT DEVICE BY EVERY
USER

6. IS A POINTING DEVICE.
 IS A POINTING DEVICE THAT CAN BE USED TO SELECT AN
OPTION ON THE SCREEN BY SIMPLY POINTING.
 CAN ALSO DRAW PICTURES USING IT.
 USED BY ARTHITECTS,ENGINEERS OR DESIGNERS.

7. It has a ball that can be rotated in different
directions to move the cursor on the screen
Found in laptops

8. It consists of a vertical stick which is used to
control screen objects.
Used to play computer games.
It provides better control than key board.

9. Allows a user to create digital drawings by hand
on a flat surface using a special pen called
STYLUS

10. IT SCANS THE OBJECT PLACED & CONVERTS IT
INTO A DIGITAL FILE

11. It takes video &still images or both .
Used in movie shootings , for photography etc.

12. Human –readable characters are printed on
documents like cheques using a special ink that
contains magnetic particles of iron oxide
Used in cheques

13. Used to detect alphabetical and numerical
characters on a page or hand written text .
It makes data entry simple and faster.

14. It is used to identify pre – specified type of
marks on a sheet.
Only compactable with pencil marks or ink.
Used for multiple choice question answer
sheets.

15. It reads print of vertical bars mostly found on
grocery items which contains data about the
product and the manufacturer.
Used in grocery stores.

16. It allows us to select a thing on the screen by
just touching it
Used in mobiles, airline and railway reservations

17. Microphone is a input device used to transmit
the human speech into electrical signals to the
computer then ,the trained computer finds
match to the signal and identifies input.

19. Machine Language
Assembly Language
High Level Languages

20. Machine Language
Can be Easily understood by the computer
In the form of 0s and 1s.
No translation required.
Difficult to write.

21. Done by praneeth