Hello friends in this video we are going
to see two different arrangements of a
register and that is star and Delta
sometimes in a circuit it is very
difficult to observe series and parallel
connections meaning it may happen that
there is no series and parallel
connections given directly but if you do
a small change in the circuit you will
definitely get number of series and
parallel connections available for that
purpose we need to study two different
topology of the resistances and those
topologies are nothing but star and
Delta till now we have seen series and
parallel connections with the help of
which we have calculated equivalent
resistance between points a and B so see
every time we were focusing only on two
points but this particular topologies
required three points so star will look
like this
so I will name this is a B C and I will
name the register RA RC and RB and Here
I am getting one more point which I will
name as n similarly Delta again three
resistors I will name the registers
let's analyze this circuit first of all
whether it's a star or Delta it's
telling about three resistors
combination so it's very important it's
talking about the three registers
compulsorily it's not like a series and
parallel where you can have n number of
registers Delta and star strictly
speaking about the three registers
combination only so how star is
distinguished from the Delta whenever
you are having one end of each register
connected together forming one more
Junction or one more point then that
particular connection is called as a
star right so I can say one end off
each registers connected together that
particular topology I will call as a
star Delta three resistors are connected
such a way that one after the other so
that it is forming a loop so I can say
three resistors are forming a loop then
those three resistors are considered to
be connected in Delta
what is the advantage of star and Delta
we have seen series and parallel
combination and now we are seeing star
which can also be represented like this
and Delta which you can represented
like this series and parallel
combinations always reduce the circuit
so the advantage of series and parallel
reduction of a circuit but as I said
earlier sometimes it is not possible to
figure out how many series and parallel
connections are given but slight change
in the circuit you may get number of
series and parallel connections so that
change can be provided by star and Delta
so star and Delta
rearrange the circuit such a way that
after using star and Delta you may get
number of series and parallel
connections of register
hence ultimately you can reduce your
circuit into one equivalent resistance
between points of interest so we will
see how we are going to use this star and
Delta in order to rearrange the circuit
which eventually leads into series and
parallel connections in order to get a
reduced circuit between points of
interest thank you
