A thermocouple measures which quantity?

A thermocouple measures which quantity?

• A. Pressure
• B. Humidity
• C. Electrical resistance
• D. Temperature

Answer: (D)

Thermocouples measure temperature. They work on the Seebeck effect: when two dissimilar metals are joined, a small voltage is produced that changes with the temperature at the sensing junction. The instrument reads that voltage and converts it into a temperature value, usually with compensation for the reference junction. They aren’t used to measure pressure, humidity, or electrical resistance—those require different sensing principles. Thermocouples are common for high-temperature sensing and fast response, with different metal types offering varying sensitivities.

Thermocouples measure temperature. They work on the Seebeck effect: when two dissimilar metals are joined, a small voltage is produced that changes with the temperature at the sensing junction. The instrument reads that voltage and converts it into a temperature value, usually with compensation for the reference junction. They aren’t used to measure pressure, humidity, or electrical resistance—those require different sensing principles. Thermocouples are common for high-temperature sensing and fast response, with different metal types offering varying sensitivities.