video resolution
—
See
resolution.
vi
ru
s
— A
program
that
is designed
to
inconvenience
you
or to
destroy data stored
on
your computer.
A virus
program moves
from
one computer
to
another through
an
infected disk, software downloaded
from the Internet, or
e-mail attachments.
When
an infected program starts,
its
embedded virus also
starts.
A
common type
of
virus is a
boot
virus,
which
is stored
in
the
boot sectors
of
a floppy disk.
If the
floppy disk is
left
in
the
drive when
the
computer is
shut
down and
then
turned on, the
computer is infected when
it
reads
the
boot
sectors
of the floppy
disk expecting
to find the
operating system.
If the
computer is infected,
the boot
virus may replicate
itself onto all the floppy
disks
that
ar
e
read
or written in that
computer
until the
virus
is
eradicated.
V — volt — The
mea
s
ur
ement
of
elect
r
i
c
potential or
electromotive force. One
V
appears across a resistance
of 1
ohm
when a current
of 1
ampere flows through
that
resistance.
W
W — watt — The
measurement
of
electrical power.
One
W
is
1
ampere
of
current flowing
at 1 volt.
WHr — watt-hour — A unit of
measure commonly
used
to
indicate
the
approximate capacity
of
a battery.
For
example, a
66-WHr
battery can supply 66
W of
power
for
1 hour or
33
W for 2 hours.
wallpaper
— The
background pattern
or
picture
on the
Windows
desktop. Change your wallpaper through
the
W
i
ndows
Control
Panel. You can also scan
in
your
favorite
picture and make
it wallpaper.
WLAN —
wireless local area network.
A
series
of
interconnected computers
that
communicate
with
each
other over
the air
waves using access
points or
wir
e
less
routers
to
provide
Internet
access.
write-protected
—
F
i
les
or media
that
cannot be
ch
an
ge
d.
Use
write-protection when you want
to
protect data
from
being changed
or
destroyed.
To
write-protect a
3.5-inch
floppy
disk, slide
its
write-protect
tab to the open
position.
WWAN —
wireless wide area network.
A
wireless
high-
speed data network using cellular technology and
covering
a
much
larger geographic area
than
WLAN.
WXGA —
wide-aspect extended graphics array
— A video
standard
for
video cards and controllers
that supports
resolutions
up to
1280
x 800."
X
XGA —
extended graphics array
— A
video standard
for
video cards and controllers
that
supports resolutions
up
to
1024
x 768.
Z
ZIF —
zero insertion force
— A
type
of
socket
or
connector
that
allows a computer
chip to
be installed
or
removed
with no
stress applied
to
either
the chip or its
socket.
Zip — A
popular data compression format.
F
i
les
that have
been compressed
with the Zip format
are called
Zip files
and usually have a filename extension
of.zip. A special
kind of
zipped
file
is a self-extracting
file, which
has a
filename extension
of
.exe. You can
unzip
a
self
-
e
x
tracting
file
by double-clicking
it.
Zip
drive
— A
high-capacity floppy drive developed
by
Iomega Corporation
that
uses
3.5-inch removable
disks
called
Zip
disks.
Zip
disks are slightly larger
than r
e
gular
floppy
disks, about twice as
thick,
and
hold up to
100
MB
of data.
158
Glossary
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