3.
There are lots of external devices that you can
connect to your computer. All external devices
connect to the computer’s system unit via
cables and ports (where a "port" is the slot into
which you plug a cable). Unless you’re using a
portable computer, you probably have several
external devices attached to your computer
already, including a
mouse, keyboard, monitor, microphone, and
speakers
4.
5. Of all the ports on a computer, USB and IEEE
1394 (a.k.a. FireWire) get all the hype. There are
several reasons for this: Both are new
technologies, both provide "hot-pluggable"
connectivity, both provide very high-speed
data transfers. The hot-pluggable part means
you can just plug in some device, like a digital
camera or video camera, and start using it right
away. (The older ports would all require you to
shut down the computer, plug in the device,
restart the
6.
7.
system unit is the part of a computer that
houses the primary devices that perform
operations and produce results for complex
calculations. It includes the motherboard, CPU,
RAM and other components, as well as the case
in which these devices are housed. This unit is
also known as a chassis or a tower in layman's
terms, and it performs the majority of the
functions that a computer is required to do.
8.
keyboard is a typewriter-style device, which
uses an arrangement of buttons or keys, to act
as mechanical levers or electronic switches.
Following the decline ofpunch cards and paper
tape, interaction via teleprinter-style keyboards
became the maininput device for computers.
computer mouse is an input device that is most
often used with a personal computer. Moving a
mouse along a flat surface can move the onscreen cursor to different items on thescreen.
Items can be moved or selected by pressing the
mouse buttons (called clicking).
9.
monitor or a display is an electronic visual
display for computers. The monitor comprises
the display device, circuitry and an enclosure.
The display device in modern monitors is
typically a thin film transistor liquid crystal
display(TFT-LCD) thin panel, while older
monitors used a cathode ray tube (CRT) about
as deep as the screen size.
Universal Serial Bus (USB) is an industry
standard developed in the mid-1990s that
defines the cables, connectors
and communications protocols used in
a bus for connection, communication, and
power supply between computers and
electronic devices.
10.
A printer is a piece of hardware for
a computer. It is a device that must be
connected to a computer which allows a user to
print items on paper, such as letters and
pictures. It can also work with digital cameras
to print directly without the use of a computer.
Computer speakers, or multimedia speakers,
are speakers external to a computer, that
disable the lower fidelity built-in speaker. They
often have a low-power internal amplifier. The
standard audio connection is a 3.5 mm
(approximately 1/8 inch) stereo phone
connectoroften color-coded lime green
(following the PC 99 standard) for
computer sound cards.
11.
headset is headphones combined with
a microphone, or one headphone with a
microphone. Headsets provide the equivalent
functionality of a telephone handset but with
hands-free operation. Headsets typically have
only one speaker driver, but may also have a
speaker for each ear.
The Game port is a port that is present on
some PC hardware, and hardware similar to it.
This port lets the connection of analog devices
used to control computer games, such
as joysticks.
