Dell Latitude C540 - Manual (Page 170)

port hub that plugs into your computer. USB devices can be connected and disconnected while the computer
is turned on and they can also be daisy-chained together.
UXGA - ultra extended graphics array
A video standard for video cards and controllers that supports resolutions up to 1600 x 1200.
V
V - voltage
video controller - The circuitry on a video card or on the system board (in computers with an integrated
video controller) that provides the video capabilities-in combination with the monitor-for your computer.
video memory - Memory that consists of memory chips dedicated to video functions. Video memory is
usually faster than system memory. The amount of video memory installed primarily influences the number
of colors that a program can display.
video mode - A mode that describes how text and graphics are displayed on a monitor. Graphics-based
software, such as the Windows operating system, displays in video modes that can be defined as x horizontal
pixels by y vertical pixels by z colors. Character-based software, such as text editors, displays in video
modes that can be defined as x columns by y rows of characters.
video resolution - See resolution.
virus - 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 via an infected disk, software downloaded from the
Internet, or e-mail attachments. When an infected program starts, its embedded virus also starts.
A virus cannot be attached to data. It must be attached to a program that is downloaded into or installed on
the computer. When the virus-attached program is run, the virus is activated. Macro viruses, although
hidden within documents (data), are similar. It is in the execution of the macro that the damage is done.
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 of 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