Question:
A thermocouple measures temperature based on the principle of:
A thermocouple measures temperature based on the principle of:
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Logic Tip: Memorize the sensor-to-principle pairs: Thermocouple = Seebeck effect. RTD = Change in resistance. Pyrometer = Radiation.
Updated On: Jun 9, 2026
- Seebeck effect
- Change in resistance
- Thermal expansion
- Radiation
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The Correct Option is A
Solution and Explanation
Concept:
Different industrial temperature sensors use different physical or electrical phenomena to translate thermal energy into a readable measurement.
Step 1: This principle is used by Resistance Temperature Detectors (RTDs) and Thermistors, where electrical resistance increases or decreases with temperature.
Step 2: This is the principle behind traditional liquid-in-glass thermometers (mercury expanding) and bimetallic strip thermometers.
Step 3: Pyrometers use this principle to measure temperature without physical contact by analyzing emitted infrared radiation.
Step 4: A thermocouple consists of two wires made of different metals joined at one end (the hot junction).
Step 5: When this junction is heated, a tiny millivolt electrical current is generated proportional to the temperature difference between the hot and cold ends. This specific thermoelectric generation phenomenon is scientifically defined as the Seebeck effect.
Different industrial temperature sensors use different physical or electrical phenomena to translate thermal energy into a readable measurement.
Step 1: This principle is used by Resistance Temperature Detectors (RTDs) and Thermistors, where electrical resistance increases or decreases with temperature.
Step 2: This is the principle behind traditional liquid-in-glass thermometers (mercury expanding) and bimetallic strip thermometers.
Step 3: Pyrometers use this principle to measure temperature without physical contact by analyzing emitted infrared radiation.
Step 4: A thermocouple consists of two wires made of different metals joined at one end (the hot junction).
Step 5: When this junction is heated, a tiny millivolt electrical current is generated proportional to the temperature difference between the hot and cold ends. This specific thermoelectric generation phenomenon is scientifically defined as the Seebeck effect.
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