Hello friends in this video we are going
to learn a new Theorem called as
superposition here it is one of the most
important theorem that we use electrical
and electronics circuit so the statement
of solution here is this I read up for a
linear system consisting of resistances
the responses here responses means
voltage or current in any branch of a
bilateral linear circuit having more
than one independent source equals the
algeberic sum of responses caused by each
independent source acting alone where
all the other independent sources are
replaced by their internal impedances so
you have to consider or understand most
important things out of this statement
whenever we have a problem of a superposition
theorem you have to list out how many
sources are there it may be voltage
source or current source whenever you are
analyzing a problem by using superposition
theorem you have to make sure that out
of number of sources given you have to
consider one source at a time replacing
remains sources with their internal
impedances so here we need to define if
there is a voltage source and how we are
going to consider and if there is a
current source as for the replacement is
concerned what should be the current
source so I will consider a voltage
source
earlier we have seen that internal
resistance or internal impedance of ideal
voltage source is 0 so you can say
R internal for the  voltage source is
0 so whenever you replace a voltage
source with an internal impedance it
should be short circuited and when current
source is given and we are supposed to
replace the current source with its
internal resistance we have seen for
ideal current so internal resistance is
infinity so infinity implies it is
open circuit
so whenever a problem is to be solved by
superposition Theorem in a circuit at a time
you will have only one voltage source or
a current source and because of that
voltage or current source whatever 
response you are getting that you have
to list out same procedure you have to follow for
number of sources present in a circuit
and finally the total response will be
the algebraic sum of all the responses
that you got because of all the sources
present in a circuit so in subsequent
videos we will solve problems based on
superposition Theorem thank you
