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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