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A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold then, an electric current wil ?

A thermocouple is made from two metals, Antimony and Bismuth. If one junction of the couple is kept hot and the other is kept cold then, an electric current wil ?

Grade:12

2 Answers

Arun
25750 Points
3 years ago
At cold junction, current flows from Antmony to Bismuth because current flows from metal having high thermo electric voltage to the metal having low thermo electric voltage.
 
Thermo electric voltage of Antimony is  +4.8 mV; Thermo electric voltage of Bismuth is -7.70 mV
Vikas TU
14149 Points
3 years ago
In thermocouple , current flows across the cold function from the later occuring metal in the series to the one occuring earler .in thermo electric series , Bismuth comes earler than antimony . So at cold function current flows from Antimony to Bismuth and at hot function from bismuth to antimony 
 

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