Question
Question: A thermo couple is formed by two metals X and Y metal X comes earlier to Y in Seebeck series. If tem...
A thermo couple is formed by two metals X and Y metal X comes earlier to Y in Seebeck series. If temperature of hot junction increases beyond the temperature of inversion. Then direction of current in thermocouple will so
A
X to Y through cold junction
B
X to Y through hot junction
C
Y to X through cold junction
D
Both (2) and (3)
Answer
Both (2) and (3)
Explanation
Solution
In the normal condition current flows from X to Y through cold. While after increasing the temperature of hot junction beyond temperature of inversion. The current is reversed i.e. X to Y through hot junction or Y to X through cold junction.