Heating Effects of Electric Current Video Lecture | Science Class 7

hello friends this video on electric
current and its effects part 7 is
brought to you by exam for your calm no
more fear from exam so now we are going
to talk about heating effects of current
so far we have discussed a couple of
things a couple of basic things about
current what is current what makes
current flow what are the important
things in an electric circuit now we
will see that current also reduces some
other effects it is not only about
blowing a bulb it also has many
additional effects when when current
flows through a wire so now we are going
to talk about the heating effects of
current which in simple words mean that
if current is flowing through a circuit
it is able to produce some amount of
heat it sounds strange but let us try to
do this try to keep your hand do not
touch a glowing bulb just try to take
your hand near a blowing but do not take
it too near as well because your safety
is first so do not touch the bell do not
take it very much near to the bulk but
it is taking hand a little near to the
bun in one case when the bulb is on
another case when the bulb is switched
off
take your hands near the bulb so do you
observe any difference in the two cases
so you will see that in case one the
first case when the bulb is blowing you
feel hot whereas in the second case you
do not feel hot and if you do not feel
cold as well but you do not feel hot so
what does it show the bulb is glowing
because current is flowing through it so
current is producing some heating effect
because of which we are feeling the heat
we are feeling hot
whereas when there is no current flowing
through the bulb there is no heat being
emitted and we are not feeling hot so
this is a simple experiment which you
can try out yourselves and you can prove
that current produces Heat
now the question is where do we
experience eating effects of current I
mean how is the heating effect of
current in use for
or where do we use them so let us look
at some examples the first common
example would be the iron so when you
iron your clothes you make use of it so
what do you do you switch you put the
plug inside the socket switch it on and
after some time what happens the iron
becomes hot so how is it becoming hot
when you you are switching it on now
when you switch it on a current flows
through the circuit inside the iron now
as current flows through it there is a
certain part of the iron which gets
heated and that heat is then utilized to
press close so basically if you look at
the internal structure of the iron box
you will see that there is a frame like
this
a frame which is shaped like this inside
this is present inside and this is made
up of nine chrome which is like an alloy
a mixture of nickel and chromium so
nickel and chromium both and metals so
these both metals they have a very high
melting point a midnight chrome as a
whole has a very high melting point and
it also does not get easily oxidized
that means it doesn't you know react
with oxygen very easily so these are the
two advantages with nichrome and that is
why nichrome is used inside iron so what
happens when current passes through this
this nichrome so it gets heated up and
this heat is what we feel from outside
and this heat is used to press your
clothes so that is one important
advantage of heating effects of current
so iron is not the only example there
are a couple of other examples for
example the diesel which we use in our
bathrooms to heat water how does a
geezer work so there are materials
present inside the diesel which are
known as the heating elements because it
is due to those elements that the
heating effect of current is experienced
so in this case this would be termed as
the heating element of iron had this
have this part not been there then we
would have not experienced the heat of
the atom right so similarly even inside
the diesel there is a heating element
present and that heating elements heats
up and that heat is then used to make
the water hot the similar concept is
used even in case of immersion rods in
fact something like this is only present
as heating element inside the Geezer
so these immersion rods can be very
clearly seen that they are made up of
some metals which when put into water
and you plug it and switch it on after
some time it gets heated up and the
water also gets heated up the hairdryer
which is used to dry your hair very
quickly this also has a nichrome wire
inside which is wrapped around an
insulating mica board so again like from
here is also because because of the
advantages of nichrome of a B'nai
melting point not easily oxidized
because of these advantages it is often
used as a heating element in various
appliances so even in hair dryers if you
have ever used a hair dryer you have
seen that when you plug it and switch it
on you can actually feel a hot air being
blown to your hair and then what air
helps your hair to drag another example
could be the electric heater which helps
to increase the temperature of the room
it helps to heat the room during winter
season so here also again you can
actually see the presence of the heating
element which are some metals which
which can be easily seen so when the
metals get heated up they actually
transfer that heat to the room and
that's how it acts as a room heater so
these are some of the applications where
where we can see how heating events of
current can be utilized so now that we
looked at so many applications of
heating effect of current how about we
define heating effect of current it is
the production of heat when electric
current passes through a material in
fact that Ash
is happening so an electric current
passes through the filament of the bulb
due to this current heat is produced
which we feel then he keep our hand near
the bun it is not necessary that all
materials will show heating effect so
this effect is actually seen due to the
presence of the heating element so in
this case the filament of the bulb it
acts as the heating element and the
presence of heating element is a must so
heating element can be defined as a coil
of wire that has a very high melting
point and it do not get oxidized when
heated so that's how we define heating
element so whichever material has this
heating element only that material will
show heating effect of current so
appliances containing such elements when
they are connected to an electric supply
and then switched on it gets heated up
now there are various fact thank you
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