Discussion
A resistance temperature detector measures temperature by
Answer: A
Correct answer: The change in electrical resistance of a metal with temperature
A resistance temperature detector exploits the fact that a metal's resistivity rises with temperature in a close to linear way. Platinum is the usual choice, being stable, repeatable and linear over a wide range.
The device is passive, so it needs an excitation current to be read - which distinguishes it from a thermocouple, whose junction of dissimilar metals generates its own voltage from a temperature difference. Bimetallic expansion and capacitance change are the mechanisms of quite different instruments.
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