Discussion
Consider the following statements about thermocouples.
1. The emf depends on the difference of the junction temperatures 2. A third metal with isothermal junctions does not affect the emf 3. The output is of the order of volts per degree
Answer: C
The first two are the fundamental facts that make the thermocouple usable and connectable. The output is tens of microvolts per degree, not volts, which is a difference of six orders of magnitude and the reason low-drift amplification is essential.
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