In layman's terms, how do you determine the resistivity constant of a non-ohmic material having measured voltage and current?
I understand that non-ohmic materials don't follow Ohm's Law, but will this still be able to be used to determine the resistance? Otherwise how can I determine an initial resistivity in order to use R=[rho]l/A to figure out the resistivity? Is there a different formula for this circumstance, or will I need to collect more data?
(Yeah, even I know it's a totally dumb question)