The confusion lies in the fact that he is measuring across the transistor and that's why his values are not coming out as you might expect. I suspect if he were to measure the resistance of the water with his device removed he would see a different value than when measuring across the electrodes attached to the device. Because internally the transistor has reached its lower limit and its internal resistance can go no lower this causes the internal transistor resistance to remain constant. Since its in a constant current configuration the current remains constant. Since the resistance is constant and the current is constant that's why the voltage across the transistor is remaining constant. (You can use conductance to calculate resistance 1/conductance=resistance).

At 04:01 AM 6/28/04, you wrote:
You are talking about how the circuit works, not circuit quantities of Volts, Current, and Resistance.

Actually, Conductance is not even one of the parameters used in the typical calculation.


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