Question:
Which of the following temperature measurement device operates on the voltage produced by two dissimilar metals?
Which of the following temperature measurement device operates on the voltage produced by two dissimilar metals?
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Thermocouple works on Seebeck effect, where two dissimilar metals produce voltage due to temperature difference.
Updated On: May 7, 2026
- Thermocouple
- Thermistor
- Mercury thermometer
- Resistance temperature detector
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The Correct Option is A
Solution and Explanation
A thermocouple is a temperature measuring device made by joining two dissimilar metals.
When the two junctions of these metals are kept at different temperatures, a small voltage is produced.
This phenomenon is called the Seebeck effect.
The produced voltage depends on the temperature difference between the hot junction and the cold junction.
By measuring this voltage, temperature can be determined.
A thermistor measures temperature by change in resistance.
A mercury thermometer works by thermal expansion of mercury.
A resistance temperature detector also works by change in electrical resistance.
Therefore, the device that operates on voltage produced by two dissimilar metals is:
\[
\text{Thermocouple}.
\]
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