Derive expression for the total resistance of a circuit in which a few resistors are connected in parallel.
Three resistance P, Q, R each of 2 Omega and an unknown resistance S from the four amrs of a Wheatstone's bridge circuit. When a resistance of 6 Omega is connected in parallel to S the bridge gets balanced. What is the value of S ?
With the help of a diagram derive the formula for the equivalent resistance of three resistances connected in parallels?