Plot a labelled graph to show variation of thermo-emf .e. versus temperature difference `.theta.` between the two junctions of a thermocouple. Mark .N. as neutral temperature and I as temperature of inversion.
(ii) What is Peltier effect ?

Show, with the help of a labelled graph, how thermo emf .e. developed by a thermocouple varies with theta , the temperature difference between the two junctions. On the graph, mark neutral temperature as theta_(N) and temperature of inversion as theta_(1) .

The temperature of inversion of a thermocouple is 620^(@)C and the neutral temperature is 300^(@)C . What is the temperature of cold junction?

If the cold junction of thermocouple is kept at 0^(@)C and the hot junction is kept at T^(@)C , then the relation between neutral temperature (T_(n)) and temperature of inversion (T_(i)) is

Assertion: Thermocouple acts as a heat engine. Reason: When two junctions of thermcouple are at different temperature, thermo emf is produced.

Above neutral temperature, thermo e.m.f. in a thermocouple

The temperature of the cold junction of thermo-couple is 0^(@)C and the temperature of hot junction is T^(@)C . The e.m.f . is E=16T-0.04 T^(2)mu volts. The temperature of inversion is

The smallest temperature difference that can be measured with a combination of a thermocouple of thermo e.m.f. 30mu V per degree and a galvanometer of 50 ohm resistance, capable of measuring a minimum current of 3xx10^(-7) amp is

The thermo e.m.f. E in volts of a certain thermocouple is found to vary with temperature difference q in .^(@)C between the two junctions according to the relation E=30 theta-(theta^(2))/(15) The neutral temperature for the thermo-couple will be:-

Thermoelectricity refers to a phenomenon that occur at the junctions of dissimilar conductors or within a single conductor, when a temperature difference exists between the junctions or across a conductor. There are three thermogalvanic effects, namely Seebeck effect, Peltier effect and Thomson effect. They involve conversion of thermal energy into electrical energy or vica versa. They are all reversible in contrast with the Joule effect which is irrevesible. Seebeck effect is the superposition of Peltier effect and Thomson effect. In a thermocouple, if the two junctions are maintained at a potential difference, a temperature difference is established, i.e. heat is generated at one junction and absorbed at the other junction. This is called Peltier effect and its converse is the Seebeck effect. The relationship between the. thermo-emf across the junction and the temperature difference is parabolic. Equation between Seebeck emf and temperature difference (0) across the function may be written as

Thermoelectricity refers to a phenomenon that occur at the junctions of dissimilar conductors or within a single conductor, when a temperature difference exists between the junctions or across a conductor. There are three thermogalvanic effects, namely Seebeck effect, Peltier effect and Thomson effect. They involve conversion of thermal energy into electrical energy or vica versa. They are all reversible in contrast with the Joule effect which is irrevesible. Seebeck effect is the superposition of Peltier effect and Thomson effect. In a thermocouple, if the two junctions are maintained at a potential difference, a temperature difference is established, i.e. heat is generated at one junction and absorbed at the other junction. This is called Peltier effect and its converse is the Seebeck effect. The relationship between the. thermo-emf across the junction and the temperature difference is parabolic. Magnitude of Seebeck emf between the junctions does not depend on