# Circuit Analysis

1. Sep 20, 2006

### piano.lisa

My goal is to derive the equation:
$R_I = \frac{R_S R_P}{R_S - R_P}$

Ri and Rp are in parallel.
Rs is in series with the other two.
Rs and Rp are variable resistance boxes. Ri is a galvanometer.
(I don't think that last point matters anyway).
Please use only Ohm's Law V=IR and any other simple circuit analysis procedure to solve.

I have already spent many hours trying to manipulate the equations-- it will be pointless to post them here; so just trust that I have.

Thank you

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