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Thermoelectric Effect/Short Question Answers :

Thermoelectric Effect (Peltier and Thomson's Effect) : Click here
Thermoelectric Effect(Seebeck Effect) : Click here

Thermoelectric Effect
Short Question Answers

1. What is thermoelectric emf ?
Ans :- The production of electricity by keeping the junctions of two dissimilar metals at different temperatures is called thermoelectric effect. The e.m.f thus produced across the junctions is called thermoelectric e.m.f. The magnitude and direction of thermoelectric e.m.f. depends on the nature of the materials forming the thermocouple and the temperature difference between the two junctions.
2. What is the cause of electric current in thermo electricity ?
Ans :- The origin of potential difference due to diffence of temperature between two parts of the same conductor or between two junctions of a thermocouple is the cause of electric curent in thermo electricity.
3. Does the thermoelectric effect obey the law of conservation of energy ? Explain how ?
Ans :- The production of thermo emf in a thermocouple is the result of conversion of the net heat absobed in the thermocouple into electric eneergy. Hence, thermoelectric effect obeys the law of conservation of energy.
4. How does the thermoelectric series helps us to know the direction of flow of current in a thermocouple ?
Ans :- If the themocouple formed of the two metals form the themoelectric series, the current flows from the metal occuring earlier in the series to the metal occuring later in the series of the cold junction.
5. If the temperature of cold junction of a thermo couple is lowered, what will be the effect on (i) neutral temperature and (ii) temperature of inversion ?
Ans :- The value of neutral temperature of the given thermocouple will emain unchanged being independent of temperature of cold junction but the value of temperature of inversion of this thermocouple will increase, as θ _i = 2 θ _n − θ _c.
6. What are the two tactors on which thermo-electric emf produced in a thermo couple depends. ?
Ans :- The factos are (i) nature of two metals forming the thermocouple and (ii) temperature difference between two junctions of the thermocouple.
7. What is thermo electric power ?
Ans :- Rate of change of thermo emf with temperature difference between the two junctions, is called as thermo-electric power.
8. Why do we generally prefe Sb-Bi thermocouple in all experimental work ?
Ans :- The thermo emf generated is large if the metal forming the thermocouple are far apart, in the thermo electric series. That is the case with Sb and Bi because Sb is the first member of the series and Bi is the last member of the series.