Peripheral Devices Video Lecture - Computer Science Engineering (CSE)

so you just bought a new computer and
with excitement you unpack it and set it
all up the first thing you want to do is
print out some photographs of the last
family party so it's time to head back
to the store to buy a printer a printer
is known as a peripheral device a
computer peripheral is a device that is
connected to a computer but is not part
of the core computer architecture the
core elements of a computer are the
central processing unit power supply
motherboard and the computer case that
contains those three components
technically speaking everything else is
considered a peripheral device however
this is a somewhat narrow view since
various other elements are required for
a computer to actually function such as
a hard drive and random access memory or
RAM most people use the term peripheral
more loosely to refer to a device
external to the computer case you
connect the device to the computer to
expand the functionality of the system
for example consider a printer once the
printer is connected to a computer you
can print out documents another way to
look at peripheral devices is that they
are dependent on the computer system for
example most printers can't do much on
their own and they only become
functional when connected to the
computer system there are many different
peripheral devices but they fall into
three general categories input devices
such as a mouse and a keyboard output
devices such as a monitor and a printer
and storage devices such as a hard drive
or flash drive some devices fall into
more than one category consider a cd-rom
drive you can use it to read data or
music input and you can use it to write
data to a CD output peripheral devices
can be external or internal for example
a printer is an external device that you
connect using a cable while an optical
disc drive is typically located inside
the computer case internal peripheral
devices are also referred to as
integrated peripherals when most people
refer to peripherals they typically mean
external ones the concept of what
exactly is peripheral
Rolle is therefore somewhat fluid for a
desktop computer a keyboard and a
monitor are considered peripherals you
can easily connect and disconnect them
and replace them if needed for a laptop
computer these components are built into
the computer system and can't be easily
removed the term peripheral also does
not mean it is not essential for the
function of the computer some devices
such as a printer can be disconnected
and the computer will keep on working
just fine
however remove the monitor of a desktop
computer and it becomes pretty much
useless here you can see a typical
desktop computer system with a number of
common peripheral devices the central
processing unit number 2 motherboard
number 8 and power supply are the core
computer system expansion slots number 4
on the motherboard make it possible to
connect internal peripherals such as a
video card or sound card not shown other
internal peripherals shown are a hard
disk drive number 7 and an optical disk
drive number 6 external input
peripherals are a scanner number-one
display monitor number 10 keyboard
number 13 and mouse number 14 external
output peripherals are a set of speakers
number 9 and a printer number 16 note
that labels 11 and 12 in the figure
refer to software and are not
peripherals there are many other
examples of peripherals such as a
microphone web camera head phos external
hard drive and flash drive most computer
users have at least several of these
peripheral devices internal peripherals
are directly connected to the
motherboard using one of the different
types of slots on the motherboard
external devices can be connected using
a wired connection or a wireless
connection as the name suggests a wired
connection uses a cable that needs to be
plugged into the computer using a
connector the most widely used connector
is a universal serial bus or USB
connection but several other types are
used depending on the specific computer
system and the type of peripheral a
wireless connection does not require a
cable the most widely used wire
connections are Bluetooth and Wi-Fi
Bluetooth is good for very short
distances so peripherals such as
wireless mouse and keyboard typically
use a Bluetooth connection Wi-Fi is good
for longer distances if you have set up
a wireless network in your home or
office you may be able to print
wirelessly to a printer if it is also
connected to the network computer
peripherals expand the functionality of
your computer some are essential for the
computer to properly function such as a
monitor and a keyboard others serve a
more specialized purpose but allow you
to do a lot more with your computer