The Seebeck effect is the principle behind which device?

The Seebeck effect is the principle behind which device?

• A. Thermistor
• B. RTD
• C. Thermocouple
• D. Capacitor

Answer: (C)

The Seebeck effect is the generation of an electrical voltage when two dissimilar metals are joined and there is a temperature difference between the junctions. A thermocouple uses this effect to measure temperature: the junction of two different metals produces a small voltage that changes as the temperature changes, and that voltage is interpreted to determine temperature (often with reference to tables or a calibration curve). This direct conversion of a temperature difference into an electrical signal is what makes a thermocouple the device associated with the Seebeck effect. Thermistors and RTDs rely on changes in electrical resistance with temperature, not the voltage produced by dissimilar metal junctions. Capacitors store and release electrical energy but do not inherently sense temperature via the Seebeck mechanism.

The Seebeck effect is the generation of an electrical voltage when two dissimilar metals are joined and there is a temperature difference between the junctions. A thermocouple uses this effect to measure temperature: the junction of two different metals produces a small voltage that changes as the temperature changes, and that voltage is interpreted to determine temperature (often with reference to tables or a calibration curve). This direct conversion of a temperature difference into an electrical signal is what makes a thermocouple the device associated with the Seebeck effect.

Thermistors and RTDs rely on changes in electrical resistance with temperature, not the voltage produced by dissimilar metal junctions. Capacitors store and release electrical energy but do not inherently sense temperature via the Seebeck mechanism.