Input And Output DevicesBy Kimberly Galea Form 3.2
KeyboardThe keyboard is the most used inputdevice. It contains a number of keys thatallows a user to enter data and informationto the computer.
The keys are divided into differentgroups 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.
MouseThe mouse is the second mostcommon used input device. Themouse controls a pointer which isdisplayed on the monitor. Thepointer controls the pointing,clicking and selecting items.
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.
Digital CameraDigital cameras allow the user to take pictureswhich are then stored digitally in a memorycard or the camera’s memory, and not liketraditional cameras which store images on thea film. The images can then be placed fromthe camera onto a computer. The quality ofthe photos is dependant on the resolution (thenumber of pixels); the larger the number ofpixels, the better the quality of the photo.Digital cameras are also capable of takingvideo 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
Touch screenA touch screen is both an input and anoutput device. The user is able to see thevarious options on the screen (output),while using his/her finger to touch aparticular option (input), at the same time.The touch screen has now become popularin a number of smartphones and tabletcomputers.
Advantages & DisadvantagesAdvantages They are user friendly.Disadvantages Needs specialised hardware and software.