3. INPUT DEVICES
An INPUT DEVICES is any peripheral
(piece of computer hardware
equipment). Which is used to provide
data and control signals to an
information processing system with the
computer acceptable language . INPUT
DEVICES make up the hardware
interface.
6. KEY BOARD
KEYBOARD- The Keyboard is a way to
input letters or numbers into different
applications of programs. A keyboard
also has special keys that helps to
operate the computer. The most
popular keyboard used today is the 101-
keys QWERTY keyboard
7. TYPES OF KEYS IN KEYBOARD
Alphabetic Keys
Numeric Keys
Function Keys
Navigation Keys
Extra Keys
9. MOUSE
A MOUSE function as a point-and –draw
device by detecting two –dimensional
motion relative to its supporting surface. We
can use it only with GUI(Graphical User
Interface) based on operating system . E.g.
Windows.
The main goal of any mouse is to translate
the motion of your hand into signals that
the computer can use.
10. TYPES OF MOUSE
MECHANICAL MOUSE – A mouse that
uses a rubber ball that makes contact
with wheels inside the unit when it is
rolled on pad of desktop.
11. OPTICAL MOUSE
OPTICAL MOUSE – A mouse that uses light
to detect movement . It emits a light and
senses its reflection as it is moved . As the
user rolls the mouse on a flat surface, the
cursor on the screen also moves in the
direction of the mouse’s movements.
13. JOYSTICK
JOYSTICK- A JOYSTICK is used to move the cursor
from place to place, and allow moves in all
directions and control such as digital, glide, direct.
They input directional data like a mouse but works by
switches as the joystick is moved. It consist of a stick
that rotate on axis and reports it angle or direction to
the device it is controlling . A joystick is used mostly
for computer games.
16. SCANNER
SCANNER- A SCANNER is used to copy
pictures of other things and save them as
files in the computer. A light moves slowly
over the surface of the picture of object to
be scanned. The colors of the reflected light
are detected and digitized to built up a
digital image.
19. TRACK BALL
TRACK BALL- A TRACK BALL is used
the same way as a mouse but it is useful
where desk space is limited. It is like an
upside down mouse because the user
rotates the ball and the main body
parts stay still. It has buttons like a
standard mouse .
21. TOUCH SCREEN
TOUCH SCREEN- A TOUCH SCREEN is a
computer display screen that is sensitive to human
touch, allowing a user to interact with the
computer by touching pictures or words on the
screen. Touch screen are used with the
information, computer -based training devices,
and system designed to help individuals who have
difficulty manipulating a mouse with a keyboard.
