Question

Thermo emf produced in a thermo couple depends on the

• A. Resistance of the elements
• B. Lengths of the elements
• C. Temperature of the junctions
• D. Sizes of the junctions

Answer 1

Answer: (C)

Temperature of the junctions

The origin of thermo emf in a thermocouple depends on the following factors:

1) Nature of the metals and

2) Temperature difference maintained between the junctions

When two metals are kept at the same temperature, there is no net emf in the circuit . When their temperatures are different, a net emf is generated in the circuit.