Detail of Input and output devices (1).ppt

Detail of Input and output devices (1).ppt

1. Input / Output DevicesInput / Output Devices

2. Input DevicesInput Devices

An input device is any hardware component An input device is any hardware component
that allows you to enter data and instructions that allows you to enter data and instructions
onto a computer. Six Widely used input onto a computer. Six Widely used input
devices are the keyboard, mouse, devices are the keyboard, mouse,
microphone, scanner, digital camera and PC microphone, scanner, digital camera and PC
video camera.video camera.

3. Output DevicesOutput Devices

An output device is any hardware component An output device is any hardware component
that conveys information to one or more that conveys information to one or more
people. Three commonly used output devices people. Three commonly used output devices
are a printer, a monitor and speakers. are a printer, a monitor and speakers.

4. Keyboards & MouseKeyboards & Mouse

KeyboardKeyboard
ItA keyboard is
one of the primary input devices  used with a
computer.
Similar to an electric typewriter, a keyboard is
composed
of buttons used to create letters, numbers,
and symbols
and perform additional functions.

MouseMouse
A computer mouse  is
a handheld hardware input
device that
controls a cursor in a GUI (graphical user
interface)
and can move and select text, icons, files,
and folders on
your computer.

5. ScannersScanners

A scanner
is an input
device that
scans
documents
such as
photographs
and pages of
text.
When a document is
scanned,
it is converted
into
a digital format. This
creates
an electronic
version
of the document
that
can be viewed and
edited
on a computer.

6. MicrophonesMicrophones
A microphone,
called
a mic or mike  is
a device
–
a transducer – that
converts sound
into
an electrical
signal.
Microphones
are used in
many
applications such
as telephones, hearing

aids, public
address
systems for
concert halls
and
public events, motion
picture production,
live and
recorded audio

engineering, sound

recording, two-way

radios, megaphones, radio a
nd television broadcasting.

7. MonitorsMonitors

A computer monitor  is
an
output
device that displays
information
in pictorial form.
A
monitor usually comprises
the visual
display, circuitry,
casing,
and power supply. 
Originally,
computer monitors
were
used for data
processing while television

sets were
used for
entertainment.
From the
1980s
onwards, computers
(and
their monitors) have
been
used for both data
processing
and
entertainment,

while televisions have

implemented
some computer
functionality.

8. PrintersPrinters
A
printer is an output
device that
prints paper
documents.
This includes
text
documents, images,
or
a combination of both.
The
two most common
types
of printers
are inkjet and laser

printers.
Inkjet printers
are
commonly used by
consumers,
while laser
printers
are a typical
choice
for businesses. Dot
matrix printers,
which
have
become increasingly
rare,
are still used for
basic
text printing.

9. SpeakersSpeakers
Speakers
are one of the most
common output
devices used
with
computer systems.
Some
speakers are designed
to
work specifically with
computers,
while others can
be
hooked up to any type of
sound
system. Regardless of
their
design, the purpose of
speakers
is to produce
audio output that
can be
heard
by the listener
.

10. Slide ProjectorsSlide Projectors
A slide projector is
a device that
is
used to view photographic
slides
by using optical and
mechanical
methods. It contains
an
electric light bulb. focusing
lenses.
reflector and condensing
lenses.
a holder that holds the
slide. 
A
flat piece of heat absorbing
glass
is often placed between the
condensing
lens and the slide, to
avoid
damaging the slide. This
glass
absorbs infrared. Light
passes
through
the transparent slide
and lens,
and
the resulting image is
enlarged
and projected onto
a screen.
So the audience can
view
its reflection.