what is input device, output device and storage device ? SOME SHORTCUT KEYS OF COMPUTER?

 . INPUT DEVICE

- A COMPUTER  HARDWARE OR DEVICE CAPABLE OF ACCEPTING DATA OR INSRUCTION E.G. 

. KEYBOARD- IT IS A STANDARD OUTPUT DEVICE. 

                         - THERE ARE THREE TYPES OF KEYBOARD.

                           (i) QWERTY 

                          (ii) AZERTY

                         (iii) DVORAK

. MOUSE 

. JOY STICK

. LIGHT PEN 

. TRACK BALL

. BAR CODE READER

. MODIFIER KEY - TAB CONTROL ALT SHIEFT

. SCANNER

. OMR\ OCR\ MICR

. KEYBOARD LOCK

. NUMBER LOCK

. SCROLLING LOCK

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 . (i) AVARAGE  KEY - 102- 104

-  (ii) LAPTOP AVARAGE KEY- 87 APROXLY

. MOUSE - THERE Are TWO TYPES OF MOUSE.

(i)- MACHANICAL MOUSE

(ii) OPTICAL MOUSE

 -INVENTOR-  DOUGLAS ANGEL BART.

- SCANNER- (i) HANDLE SCANNER

                      (ii) FLAT BAD

- OMR- OPTICAL MARK READER

- OCR- OPTICAL CORRECTER READER

- MICR- MAGNETIC INK

. OUTPUT DEVICE

A COMPUTER HARDWARE OR DEVICE CAPABLE OR DISPLAYING THE RESULT OF THE PROCESSED DATA E.G.

(i) MONITOR

(ii) PRINTER

(iii) SPEAKER

(iv) WEBCAM

(v)  HEAD PHONE

-it is a standard type of output device.

VDU- visual display unit.

there are three types of VDU.

(i) CRT- CATHODE RAY TUBE

(ii) LCD- LIQUID CRISTAL DISPLAY

(iii)LED- LIGHT EMITTING DIOD

-  PRINTER-  THERE ARE TWO TYPES OF PRINTER.

 (i)   IMPACT

(ii)  non impact

 

.STORAGE DEVICE

A COMPUTER HARDWARE OR DEVICE USED FOR STORING INFORMATION PERMANENTLY .  IT IS ALSO KNOWN AS SECONDARY MEMORY.  E.G.

- HARD DISK -  INVENTED BY  -  IBM

- FLOPPY DISK - INVENTED BY IBM

- COMPACT  DISK(CD)- INVENTED BY PHILLIPES AND SONY .  

- PEN DRIVE  -  INVENTED BY - IBM AND M - SYSTEM 

- PEN DOV MORAN 

- PEN DOV 

- NOTE-  ONLY FOR KNOWLEDGE. USEFUL TO PLEASE SHARE NOW YOUR FRIENDS.