Discussion
Which statement about a thermocouple is false?
Answer: D
Correct answer: It requires an external excitation supply
A thermocouple is self-generating: the Seebeck effect produces a small electromotive force at the junction of two dissimilar metals, so no excitation current is needed. That is one of its practical advantages, and it distinguishes it from a resistance thermometer, which must have a current passed through it to be read.
The other three statements are true. The output depends on the temperature difference between hot and cold junctions, the device generates its own voltage, and cold junction compensation is required to turn that difference into an absolute reading.
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