Hello everyone. I have what is probably a relatively simple question. I'm trying to calculate the resistance between two rectangular copper plates submerged in water. I found this thread that briefly discusses it: https://www.physicsforums.com/threa...ween-two-electrodes-filled-with-water.147144/ The equation: R = (ρ*L)/A seems pretty straight forward but I have a question about the area, A. Is the area in the equation the area of a single copper plate, or the sum of both plates? For instance, if I have two parallel rectangular copper plates each with a surface area facing the other of 1 in2, should I use 1 in2, or 2 in2 in the equation? I'm thinking I should just use 1 in2 but I'm not sure. Perhaps if someone can share or point me to a derivation of the formula, that would clarify things. Thanks in advance for any help you can provide.