In this case, the output voltages of the two thermocouples turn out to be equal (e1 = e2); thus, the voltage De measured by the voltmeter is null.
In Figure 3.6(b), this situation is highlighted by the working point T equal for both thermocouples.
By applying a load L with a corresponding current iL, a voltage drop across S arises, causing an imbalance between currents i1 and i2.
With the hypothesis that r