Input and Ouput devices.

Input and output devices

What is input?

Input is any data or instructions entered into the memory of the computer.

Some examples of input devices are: mouse which is the most wiidely used pointing device on personal computers.

:keyboard which contains keys that allow the user to enter data by typing.

: trackball is a stationary pointing device with a ball machism on its top. It doesn't need a lot of space on the desk because the user doesn't have to move the entire device.

What is output device ?

Output is data that has been processed into a used form, called information.

Examples of output devices are the printers the VDU (visual display unit)

There are many types of printers

: Dot matrix printer

 

: Inkjet printer

:Laser printer

: Plotter (non impact)

What is impact?

Impact is forms characters and graphics on a piece of paper by striking a mechanism against an ink ribbon that physically strike the page.

 

What is vector?

Vector is an image that constructs the image from a series of lines segments and when you get the picture bigger the picture is still recognisable.

 

What is a raster?

A raster is a picture made up from pixels. The more pixels you have the more the picture is recognisable.When the picture get bigger it will not be recognisable.

 

What is resolution?

Resolution is how sharp the picture is. The more pixels the picture has the more sharp the picture will be.