Page 22 - Viva ICSE Computer Studies 7 : E-book

• Dot Matrix Printer: A dot matrix printer works like a typewriter.
The printer head strikes the paper and the ink ribbon to print
characters. It is also called the impact printer. This printer is slow
and noisy but economical, reliable and durable.

• Inkjet Printer: Inkjet printer is also called a non-impact printer
because there is no contact between the printer head and the
paper. Printing is done line by line by spraying ink on a sheet
of paper. These printers are much faster than the dot matrix
printers. They are more expensive and consume more ink. Ink
cartridges are used in inkjet printers.

• Laser Printer: Laser printer is a non-impact printer that uses
laser beams to print on paper. These printers are much faster
than inkjet printers and the print quality is much superior.
However, they are expensive and are mainly used in places
where fi ne quality printing is required.

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An inkjet printer provides a print resolution of around 360 dots per inch (DPI).

Projector
A projector displays the images generated by the computer on
a large screen. It is connected to a CPU instead of a monitor. It is
used in schools and colleges to display presentations and to show
movies. It is also used in offi ces for giving presentations.

Think and Discuss Storage Devices
Storage devices are used to store information for a
Which device is also called fl ash
drive? Can it be used to copy data. longer period of time, until it is deleted or overwritten.
Justify your answer. Let’s learn about some storage devices.

Disk Tracking arms
Hard Disk
Hard disk is the main storage medium for computers. It is fi xed
Disk head
inside a CPU box and is capable of storing a large amount of
data. A hard disk can store up to 8 TB of data. It is made up
of many rigid metal plates coated to store data magnetically.
A hard disk rotates while
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it is being recorded.
Sealed
A hard disk is also known as a fi xed disk. container

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