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The speed of a CPU is measured in Megahertz. Higher the value, faster is the
information processed by the CPU.
OUTPUT DEVICES
The output devices are used to display the information and result of computation
to the user. Some of the output devices are:
Monitor
The monitor is one of the most familiar output device. It is
called the Visual Display Unit (VDU). The images that you
see on the monitor are made up of tiny dots called pixels.
The clarity of the images depends on the number of dots/
pixels on the screen per inch. The maximum no. of dots per
inch (dpi) will give you more clarity or better display
Nowadays, monitors with Liquid Crystal Display (LCD)
screens have become very popular because of the clarity of Monitor
the images and the slim shape of the monitor.
Printer
A printer is an output device that allows to print the work done on the computer
on a sheet of paper. Printers are categorised as impact or non-impact depending
on their working. Impact printers create an image on a paper by striking the paper
with a metal. Non-impact printer create an image on a paper by spraying ink on
the paper. Some of the common printers are:
1. Dot matrix printer
Dot matrix printers work like a typewriter. The printer
head strikes the paper and ink ribbon to print a
character. It is an impact printer.
Dot matrix printer
2. Inkjet printer
Inkjet Printers are non-impact printers. Printing is
done line-by-line by spraying ink on a sheet of paper.
These printers are much faster than dot matrix printers.
However, these are more expensive and consume more
Inkjet printer ink. Inkjet printers use ink cartridges.
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