Answer :

(a) Here both resistance i.e. R1 = 500 ohm, R2 = 1000 ohm are connected in series

So equivalent resistance R = R1 + R2 = 500 + 1000 = 1500ohm.


(b) Here both resistance i.e. R1=2ohm, R2=2ohm are connected in parallel


So equivalent resistance


1/R=1/R1+1/R2


1/R=1/2+1/2


R=1ohm


(c) Here resistance R1=4ohm and R2=4ohm are in parallel and R3=3ohm are in series


According to the given figure,


1/R=1/R1+1/R2


1/R=1/4+1/4


R=2ohm


Total resistance of the given circuit =R+R3


=2+3=5ohm


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