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Hello Dana, Thank you for the answer.

This is a lot of information to digest, but to be clear:

1) In the link that you sent me under 'possible signal conditioning', then in my case, the 'LOAD' would be the polymer, and the low-side sensing element would be some resistor of appropriate value that is in series with the polymer to allow the op-amp to measure the voltage drop, right?

2) In the figure 3 of the same file, it seems like the output is voltage modulated (?) as in, the output is equal to the voltage difference between the inverting input and the non-inverting input, multiplied by some gain. If so, am I supposed to measure the current by using Ohm's law (assuming the gain remains constant (?)

3) I did some cursory research and I'm unsure what exactly the difference is between a Transimpedance Amplifier vs the INA. Why is the latter recommended over the former in this case?

Thank you.