List - I List - II
a) Peltier effect e) irreversible
b) Joule heating effect f) reversible
c) Thomson effect in Pb g) negative
d) Thomson effect for h) zero.
metal like Fe
List - I List - II
a) Peltier effect e) irreversible
b) Joule heating effect f) reversible
c) Thomson effect in Pb g) negative
d) Thomson effect for h) zero.
metal like Fe
The correct option is B a - f ;b - e;c- h;d - g
Peltier effect is reversible:
The heat absorbed or evolved at a junction of two metals when current is passed is Peltier effect. At the hot junction, current flows in the direction of the Peltier emf and the emf does work making the junction cool. Conversely when the current flows against the direction of Peltier emf, work is done on the emf and energy is liberated making the junction hot. Thus, Peltier effect is reversible.
Joule heating effect is irreversible:
Joule heating effect is produced when current is passed through a conductor and the amount of heat evolved is proportional to the square of the current. Joule heating effect is independent of the direction of the current and is always a heating effect. (irreversible)
Thomson effect in lead:
Thermoelectric power in lead is zero and does not exhibit Thomson effect. Thus, lead is taken as a strand in the thermoelectric series and metals to the right of lead are considered thermoelectrically negative and those to the left are positive.
Thomson effect in Fe:
Since Fe lies to the left of lead in the thermoelectric series, it is thermoelectrically negative and Thomson effect is negative.
Peltier effect is reversible:
The heat absorbed or evolved at a junction of two metals when current is passed is Peltier effect. At the hot junction, current flows in the direction of the Peltier emf and the emf does work making the junction cool. Conversely when the current flows against the direction of Peltier emf, work is done on the emf and energy is liberated making the junction hot. Thus, Peltier effect is reversible.
Joule heating effect is irreversible:
Joule heating effect is produced when current is passed through a conductor and the amount of heat evolved is proportional to the square of the current. Joule heating effect is independent of the direction of the current and is always a heating effect. (irreversible)
Thomson effect in lead:
Thermoelectric power in lead is zero and does not exhibit Thomson effect. Thus, lead is taken as a strand in the thermoelectric series and metals to the right of lead are considered thermoelectrically negative and those to the left are positive.
Thomson effect in Fe:
Since Fe lies to the left of lead in the thermoelectric series, it is thermoelectrically negative and Thomson effect is negative.
