How an Electric Bell Functions - Electricity Circuits Video Lecture - Class 6

good morning children today we shall
learn how an electric Bell works most of
us have seen it you know this well also
works on electromagnet confused
let us first refresh our memories we
already know when the electric current
passes through a wire it behaves like a
magnet
this is the magnetic effect of electric
current also a current carrying coil of
an insulated wire wrapped around a piece
of iron is called an electromagnet the
power of this electromagnet can be
increased by increasing the number of
turns of the coil it can also be
increased by increasing the flow of
current through the coil let us also not
forget electromagnet can also be turned
off by stopping the electric flow of
current which made it a magnet now that
we are clear about the electromagnet let
us now understand how an electromagnet
is used in the functioning of an
electric Bell let us see the simplified
circuit of an electric bill with the
switch in off position it consists of a
coil of wire bound on an iron piece bent
to form U shape like a horseshoe magnet
a spring-loaded arm made of an iron
strip is kept close to the electromagnet
this arm has a hammer attached to it at
one end let us call it a clapper a small
gong or Bell is also placed near the
hammer see there is a contact screw near
the clapper now let us switch on the
circuit
and the fun begins right now
the clapper isn't the contact with this
crew
so the circuit is complete and the
current flows through the coil due to
the current flow the coil becomes an
electromagnet the electromagnet then
pulls the clapper towards itself in this
process the hammer at the end of the
clapper strikes the gong of the well to
produce a sound let us see what else
happened when the electromagnet pulled
the clapper and we heard the hammer
striking the gong look closely right now
the clapper is not in contact with the
screw the circuit is broken now so what
will happen next the current through the
coil will stop flowing will the coil
remain an electromagnet no it wouldn't
the coil is no longer an electromagnet
as we know it's the flow of the current
that gives the coil its magnetic power
so it no longer attracts the clapper the
clapper Springs away from the Bell back
to its original position and touches the
contact screw again this completes the
circuit the current flows in the coil
and the hammer strikes the gong again
this process is repeated again and again
very quickly thus the hem of strikes the
gong every time the circuit is completed
this is how the bell rings interesting
application of an electromagnet isn't it
so in a nutshell by turning an
electromagnet on and off we made a
useful thing an electric Bell using this
electromagnet we created the movement of
the clapper to ring the bell
with the current flow the electromagnet
attracted the clapper ringing the bell
but it also broke the circuit and
stopped the current flow due to this the
electromagnet lost its magnetic power
and the clapper went back to its
original position making their contact
with the screw again this made the
circuit complete and again the clapper
struck the gong great isn't it so the
next time if you get any chance to
analyze the circuit of an electric bill
see you next time till then have fun bye
bye kids