L11 : Electromagnet - Electric Current & Circuits, Science, Class 7 Video Lecture

hello friends this video on electric
current and its effects part 11 is
brought to you by exam for your calm no
more fear from exam so now that we are
talking about the magnetic effects of
current let us talk about a special type
of magnet quant electromagnet the name
itself is electromagnets that means a
magnet which works now in close relation
or in close association with electricity
that is why the name electromagnet so it
is a magnet in which electric current
produces magnetic field so basically
this is a magnet but the main principle
within this magnet because of which
magnetic field is produced is nothing
but the electric current so construction
wise it generally consists of large
number of closely spaced tones of wire
as you can see here this blue thing
which you see which is like kind of tied
over a coal so that this is the wire the
blue color thing and inside you have a
cone now if the core is magnetic like if
it is made up of materials like iron
this can make it all the more powerful
magnet so it depends on the material of
the code that how strong the
electromagnet is and also where the
current flows the current flows through
this wire which is present above the
hole so when current flows through this
wire magnetic field is produced so that
is how electromagnet works now the
advantage of electromagnet is that it is
more flexible in controlling the
magnetic field so when we say more
flexible we mean that when the current
is on when electric current is on
magnetic field is produced when electric
current is off no magnetic field is
produced so you know the control is
pretty much easy you just switch on and
switch off the electric current your
magnetic field is also controlled
accordingly so when your current is on
that magnetic field is produced or we
can say magnetic field is also on when
current is off
magnetic field is also so it is pretty
much easy to control the amount of
magnetic field that is produced out of
this magnet so this type of
electromagnetic it also has advantages
over the normal permanent magnets where
which are like pure magnets they do not
make use of the magnetic effect of
electric current so the advantage is
that here this control thing here the
control is over the current so by
changing the current we can change the
magnetic field but in case of permanent
magnets that is not the case because
each permanent magnet will will produce
a specific amount of magnetic field and
we do not have any control over the
amount of magnetic field that is
produced by the formalin magnets so that
is also one advantage because of which
electromagnets are right used now where
do we use electromagnets where do we use
this kind of magnets now electromagnets
are very commonly used as components of
many many electrical devices so some of
the examples are the cranes now these
cranes are used to move heavy objects
they are used to lift heavy objects now
they have electromagnets here so what
happens is all the magnetic materials
can be very easily picked up for example
iron and these kind of things which are
very heavy at the same time you know
very difficult to locate so when you
have magnets it becomes very easy easy
to lift these set of materials as
magnetic separators so magnetic
separators what are these so they are
used to separate ferromagnetic materials
from a waste dump of other metals so you
I have plenty of other metals now you
want to separate the ferromagnetic
material so how will you do that for
example scrap iron or steel how do you
do that so with the help of these
electromagnets so when you switch on the
current the magnetic field is enjoyed it
starts behaving like a magnet and it
acts as magnetic separator when you do
not need it just switch off the current
it will no more behave like a magnet
so these electromagnets they find the
application in small-scale industries as
well
in large-scale industry missionaries
know some of few more examples are the
hard disks and hard disks also we have
electromagnets you talk about the
loudspeakers there also you have
electromagnets you talk about the motors
you talk about the MRI machines in
hospitals so in all of these you have
electromagnets playing an important role
electric Bell a very common thing which
we remind encountered in our day to day
life so in electric bells also we see a
major role of electromagnets the
induction heaters these and this has
become very common these days so that
induction cooking tops the induction
different vessels and also these
induction bed heaters they also rely on
electromagnets because the electromagnet
they convert electrical energy into heat
energy and that's how heating happens in
induction heaters so these
electromagnets are used in a variety of
applications now how they actually the
world that we will see looking at the
working of an electric bill so we are
going to discuss about electric Bell in
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