Thu July 07, 2011 By: Pooja Kulshrestha

How to derive the formula step- wise

Expert Reply
Thu July 07, 2011

Resistance in Parallel 



If the resistance are in parallel, the potential difference across each is the same, but the current is not. Then,

I = I1 + I2 + I3


Since charge is not accumulated at a point,


where Rp is the equivalent resistance of the combination. Therefore,


For the special case of only two resistors in parallel, the expression for the equivalent resistance takes on a particularly simple form, i.e.,









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