This document provides information about different types of input devices for computers including keyboards, mice, joysticks, trackballs, and touch screens. It discusses how each device is used to control movement of the cursor or pointer on a display screen. The document is part of an online computer class about input and output devices and assigns homework from the chapter.

1. MRS: LARAIB ALI
WELCOME TO
COMPUTER
ONLINE CLASS.

2. INPUT AND OUTPUT DEVICES
CHAP #03
INPUT DEVICES
In computing, an input device is a pi
ece of equipment used to provide d
ata and control signals to an inform
ation processing system such as a c
omputer or information appliance. E
xamples of input devices include key
boards, mouse, scanners, digital cam
eras, joysticks, and microphones

4. KEYBOARD
A computer keyboard is a typew
riter-style device which uses an a
rrangement of buttons or keys to
act as mechanical levers or electr
onic switches. Following the decli
ne of punch cards and paper tap
e, interaction via teleprinter-styl
e keyboards became the main in
put method for computers

6. MOUSE
A mouse is a device that co
ntrols the movement of the
cursor or pointer on a displa
y screen. A mouse is a small
object you can roll along a h
ard, flat surface. ... As you m
ove the mouse, the pointer
on the display screen moves
in the same direction

8. JOYSTICK
A joystick is an input device co
nsisting of a stick that pivots on
a base and reports its angle or
direction to the device it is cont
rolling. ... Joysticks are often us
ed to control video games, and
usually have one or more push-
buttons whose state can also be
read by the computer

10. TRACKBALL
In computing, a trackball is a po
inting input device. It consists o
f a ball held by a socket contain
ing sensors to detect a rotation
of the ball about two axes. It is l
ike an upside-down mouse with
a ball that sticks out. The user r
olls the ball with the thumb, fin
gers or the palm of the hand to
move a cursor.

12. TOUCH SCREEN
A touchscreen, or touch
screen, is a both input a
nd output device and nor
mally layered on the top
of an electronic visual dis
play of an information
Processing.

15. HOME WORK
Do exercise A,B,D
page no# 23,24
From chapter#03INPUT
AND OUTPUT DEVICES.