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Information and Communication Technology Applications

Figure 1.2
Notes

Digital flash drives work slightly differently as they use memory cards to store
information so there are no moving parts. Digital cameras also use Flash memory
cards to store information, in this case photographs. Hand held devices use digital
drives and many also use removable or built in memory cards.

Mouse: Most modern computers today are run using a mouse controlled pointer. Generally if the
mouse has two buttons the left one is used to select objects and text and the right one is used to access
menus. If the mouse has one button (Mac for instance) it controls all the activity and a mouse with
a third button can be used by specific software programs.
One type of mouse has a round ball under the bottom of the mouse that rolls and turns two wheels
which control the direction of the pointer on the screen. Another type of mouse uses an optical
system to track the movement of the mouse. Laptop computers use touch pads, buttons and other
devices to control the pointer. Hand helds use a combination of devices to control the pointer,
including touch screens.

It is important to clean the mouse periodically, particularly if it becomes sluggish. A
ball type mouse has a small circular panel that can be opened, allowing you to remove
the ball. Lint can be removed carefully with a tooth pick or tweezers and the ball can be
washed with mild detergent. A build up will accumulate on the small wheels in the
mouse. Use a small instrument or finger nail to scrape it off taking care not to scratch
the wheels. Track balls can be cleaned much like a mouse and touch-pad can be wiped
with a clean, damp cloth. An optical mouse can accumulate material from the surface
that it is in contact with which can be removed with a finger nail or small instrument.

Monitors: The monitor shows information on the screen when you type. This is
called outputting information. When the computer needs more information it will display a message
on the screen, usually through a dialog box. Monitors come in many types and sizes. The resolution
of the monitor determines the sharpness of the screen. The resolution can be adjusted to control the
screen’s display..
Most desktop computers use a monitor with a cathode tube or liquid crystal display. Most notebooks
use a liquid crystal display monitor.
To get the full benefit of today’s software with full colour graphics and animation, computers need
a color monitor with a display or graphics card.

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