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212 Glossary
find the operating system. If the computer is infected, the boot virus may replicate itself
onto all the floppy disks that are read or written in that computer until the virus is
eradicated.
V — volt — The measurement of electric 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 Windows 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 wireless routers to
provide Internet access.
write-protected — Files or media that cannot be changed. 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.
WPAN — wireless personal area network. A computer network used for communication
among computer devices (including telephones and personal digital assistants) close to
one person.
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.