Wednesday, January 2, 2013

Combination of Resistors – Parallel

In parallel combination of two resistors, the charge that flows in at A from the left flows out partly through R1 and partly through R2. The currents I, I1, I2 shown in the figure are the rates of flow of

Charge at the points indicated. Hence,

The potential difference between A and B is given by the Ohm’s law applied to R1, V = I1 R1. Also, Ohm’s law applied to R2 gives V = I2 R

 If the combination was replaced by an equivalent resistance Req, by Ohm’s law

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