Monitor
Another term for display screen. The term monitor,
however, usually refers to the entire box, whereas
display screen can mean just the screen. In addition,
the term monitor often implies graphics capabilities.
System Unit
The main part of a personal computer.
The system unit includes the chassis,
microprocessor, main memory, bus,
and ports, but does not include the ke-
yboard or monitor, or any peripheral devices.
A system unit is sometimes called a box or main unit.
Keyboard
The set of typewriter-like keys that enables you
to enter data into a computer. Computer keyboards
are similar to electric-typewriter keyboards but
contain additional keys. The keys on computer
keyboards are often classified as follows:
alphanumeric keys -- letters and numbers
punctuation keys -- comma, period, semicolon,
and so on.
special keys -- function keys, control keys, arrow
keys, Caps Lock key, and so on.
Mouse
A device that controls the movement of the cursor
or pointer on a display screen. A mouse is a small
object you can roll along a hard, flat surface. Its
name is derived from its shape, which looks a bit
like a mouse, its connecting wire that one can ima-
gine to be the mouse's tail, and the fact that one
must make it scurry along a surface. As you move
the mouse, the pointer on the display screen moves
in the same direction. Mice contain at least one
button and sometimes as many as three, which have
different functions depending on what program is
running. Some newer mice also include a scroll wheel
for scrolling through long documents.
Speaker
An electro-acoustic transducer that converts electrical
signals into sounds loud enough to be heard at a distance.
Synonymous with loudspeaker.
AVR (Automatic Voltage Regulator)
AVR is an abbreviation for Automatic Voltage Regulator
.It is important part in Synchronous Generators,
it controls the output voltage of the generator by controlling
its excitation current. Thus it can control the output
Reactive Power of the Generator.
UPS(Uninterruptible Power Supply)
Short for uninterruptible power supply, a power
supply that includes a battery to maintain power in
the event of a power outage. Typically, a UPS keeps
a computer running for several minutes after a power
outage, enabling you to save data that is in RAM and
shut down the computer gracefully. Many UPSs now
offer a software component that enables you to
automate backup and shut down procedures in case
there's a power failure while you're away from the
computer.
