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Joystick: It is a pointing device that is used to control movement of a pointer
on your computer screen. It is mostly used to play games.
Joystick
Microphone: It is an input device that is used to record voice, music, and
sound into the computer system. It captures sound waves and converts them
into digital form.
Microphone
Output Devices
Output devices are used to display information or result of a computation to the user. Some of
the output devices are:
Monitor: It is one of the most familiar output devices. It is also
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 per inch on the
screen. The maximum number of dots per inch (dpi) will give you
more clarity and a better display. Nowadays, monitors with Light
Monitor Emitting Diode (LED) screens have become very popular because of
clarity of images and slim shape of the monitor.
Printer: It 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 paper by striking the paper with a metal pen. Non-impact printers create an image
on paper by spraying ink on the paper. Some of the common printers are:
• Dot Matrix Printer
It works like a typewriter. The printer head strikes the paper and
ink ribbon to print a character. It is an impact printer.
• Inkjet Printer Dot Matrix Printer
It is a non-impact printers that use ink cartridges. Printing is done line-
by-line by spraying ink on a sheet of paper. It is much faster than a dot
matrix printer. However, they are expensive and consume more ink. It is
widely used in schools, offices, and cinema halls.
Inkjet Printer
• Laser Printer
It is also a non-impact printer. It uses a laser beam to print on the
paper. It is much faster than an inkjet printer and the print quality also
superior. However, it is expensive and is mainly used in places where
fine quality printing is required.
Laser Printer
12 iPro (Ver. 4.1)-VII

