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
R2
If the combination was replaced by an equivalent
resistance Req, by Ohm’s law
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