Page 47 - gyamfi series vol. 2

INFORMATION AND COMUNICATION TECHNOLOGY GYAMFI SERIES
HEAD PHONE
It is used for outputting sound. It helps us to hear sound when we play music or watch movies
on our computer.
PROJECTOR
It is used to display or beam the information on the computer’s screen onto an external large
screen. This is normally used in presentations and seminars where there are
lots of people.
DIGITAL WATCH
It is used for recording time taken to perform an activity. For instance it can be
used to time the
athlete taking the 200m race.
PRINTER
The printer is an output device that is used to print text and images onto a paper. Document on
the computer is called SOFTCOPY while a document which has been printed onto a
paper is
called HARDCOPY. There are two (2) primary categories of printers

1. Impact printer 2. Non-impact printer

Impact printers create image by using pins or hammers to press an inked ribbon against the
paper. A simple example is the typewriter which uses small hammers to strike the ribbon. Other
examples include the line printers, band printers, dot matrix which was once the most popular
type of printers used in PC’s. Impact printers can produce carbon copies.
A non-impact printer is a printer that forms texts or graphics image by
spraying or using ink to
the page. In other words, non-impact printers don’t have mechanisms that
strike the paper.
Instead, they spray ink or use laser beams to transfer marks on the paper.
The most common non-impact printers are ink-jet printers and Laser
Printers.
Ink-jet printers spray tiny droplets of ink onto the page of a paper at a high speed.
Laser printer uses a technology similar to that use in photocopying machine. It uses heat to
adhere particles of toner to specific points on the page.
USES/IMPORTANCE OF OUTPUT DEVICES
1. The monitor allows the user to see what the computer has processed.
2. The speaker allows the user to hear the output when it is in the form of a sound.
3. Output devices change information from machine readable form to human readable
and understandable form.

QUESTIONS
B.E.C.E 2015
4C) What is screen tip?
Screen tip is a graphical user interface feature in which a small text box appears when a
mouse pointer is hovered over an icon or button. Or Screen tip is a pop up icon that provides
details that explains the icon or buttons functions.
4d) describe a computer mouse pad.

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