I have a test project where I am applying 10 volts DC to a hydrogel electrode. The hydrogel electrode is attached to a test PCB.
The hydrogel electrode measures 2" x 2". The test PCB measures 3.5" x 3.5".
The test PCB has 20 test pads which trace to 20 test probe points. The goal is to measure the voltage that is conducted through the hydrogel electrode to the test pads and ultimately to the test points. There is a voltage drop due to the resistance of the hydrogel electrode of approximately [url removed, login to view] (varies). The purpose of the 20 test pads lying under the hydrogel electrode is to measure the current dispersion in the pad. This all works well. I am using a regulated power supply and the DC voltage is very stable. I am not getting a measurable amp reading.
My project is this: Given this test setup how can I determine the resistance or inversely the conductance of the hydrogel electrode. I am missing the current measurement but I do have very good data on the voltage drop.
Is there a formula for determining the current and/or resistance from the voltage drop?
I am not an electrical engineer. The solution needs to be simple. I can't get involved in complicated test setups or calculations.
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I am an electrical engineer having 9 years of working experience, the problem is very simple, u will get the solution within one day of awarding the bid on me.