Question

Q) study the variations of thermo emf across two junction at a theomocouple with thermometer.​

Answer 1

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• If two junction of a thermocouple are maintained at different temperatures then a thermo e.m.f. is developed between them.
• It can be measured by balancing it against the potential drop across a length „l‟(say) of the potentiometer wire.

Answer 2

Explanation:

For copper-iron thermocouple, the current flows from copper to iron through the hot junction, and the thermo-emf generated is about 13.9 × 10−6 V for each degree rise of temperature between the two junctions.

\implies⟹

If two junction of a thermocouple are maintained at different temperatures then a thermo e.m.f. is developed between them.

It can be measured by balancing it against the potential drop across a length „l‟(say) of the potentiometer wire.