Question

Thermo electric thermometer is quick in action because the thermal capacity of the hot junction is:

• A. Less
• B. More
• C. Equal
• D. Zero

Answer 1

The correct option is A Less

A thermoelectric thermometer is thermocouple constructed using suitable metals of which one junction is kept at a fixed temperature that acts as a reference( 0 ${}^{\circ }C$ preferred or room temperature) and the other junction in hot region to determine the unknown temperature If $e_t$ is the thermo emf then the unknown temperature t can be determined from the calibration curve as shown.An advantage of this thermocouple thermometer is that it is quite sensitive to measure temperature accurately and has low thermal capacity. The thermometer is quick in attaining the temperature of the hot body for rapid variation in temperatures.