3. Keyboard
The keyboard is the most used input
device. It contains a number of keys that
allows a user to enter data and information
to the computer.
4. The keys are divided into different
groups according to their use:
Alphabet keys
Function keys
Numeric keys
Arrow keys
Commands keys
5. Advantages &
Disadvantages
Advantages
Typists can enter data very quickly.
Keyboards are less expensive because it
comes with every computer.
Disadvantages
One can easily make mistakes when typing.
Excessive use can lead to Repetitive strain
injury.
7. Mouse
The mouse is the second most
common used input device. The
mouse controls a pointer which is
displayed on the monitor. The
pointer controls the pointing,
clicking and selecting items.
8. Advantages & Disadvantages
Advantages
Ideal to use with desktop computers.
Usually supplied as part of a new computer
system.
Disadvantages
Excessive use can lead to Repetitive strain
injury.
They need a flat space close to the
computer.
10. Digital Camera
Digital cameras allow the user to take pictures
which are then stored digitally in a memory
card or the camera’s memory, and not like
traditional cameras which store images on the
a film. The images can then be placed from
the camera onto a computer. The quality of
the photos is dependant on the resolution (the
number of pixels); the larger the number of
pixels, the better the quality of the photo.
Digital cameras are also capable of taking
video clips.
11. Advantages & Disadvantages
Advantages
No film is needed, no developing costs to view the
photos
Photos can be viewed or deleted immediately after
being taken
Images can be edited or enlarged
Images can be placed directly on to a computer
Images can be uploaded onto websites
33. Touch screen
A touch screen is both an input and an
output device. The user is able to see the
various options on the screen (output),
while using his/her finger to touch a
particular option (input), at the same time.
The touch screen has now become popular
in a number of smartphones and tablet
computers.
