Post on 21-Jun-2015
Input And Output Devices
By Kimberly Galea Form 3.2
INPUT DEVICES
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.
Keyboard
The keys are divided into different
groups according to their use:
Alphabet keys Function keys Numeric keys Arrow keys Commands keys
Advantages & DisadvantagesAdvantages
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.
Keyboard
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.
Mouse
Advantages & DisadvantagesAdvantages 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.
Mouse
Digital CameraDigital 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.
Advantages & DisadvantagesAdvantages 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
Disadvantages
Digital Camera
Bar Code Reader
Advantages & DisadvantagesAdvantages
Disadvantages
Barcode Reader
Optical Mark Recognition
Advantages & Disadvantages
Advantages
Disadvantages
Optical Mark Recognition
Optical Character Recognition
Advantages & Disadvantages
Advantages
Disadvantages
Optical Character Recognition
Magnetic Ink Character Reader
Advantages & DisadvantagesAdvantages
Disadvantages
Magnetic Ink Character Reader
Scanner
Advantages & DisadvantagesAdvantages
Disadvantages
Scanner
Joystick
Advantages & DisadvantagesAdvantages
Disadvantages
Joystick
INPUT AND OUTPUT DEVICES
Touch screenA 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.
Advantages & Disadvantages
Advantages They are user friendly.
Disadvantages Needs specialised hardware and
software.
Touch screen
OUTPUT DEVICES
Printer
Advantages & DisadvantagesAdvantages
Disadvantages
Printer
Visual Display Units
Advantages & DisadvantagesAdvantages
Disadvantages
Visual Display Units