Chemical Engineering - Process Control and Instrumentation - Discussion

1. Seebeck effect. It states that the voltage produced in a thermocouple is proportional to the temperature between the two junctions.

2. Peltier effect. It states that if a current flows through a thermocouple one junction is heated (puts out energy) and the other junction is cooled (absorbs energy).

3. Thompson effect. It states that when a current flows in a conductor along which there is a temperature difference, heat is produced or absorbed, depending upon the direction of the current and the variation of temperature.

So, the answer is Seebeck effect.

How it is possible?

Not clear this ans?

Please explain in details.

@Pronita @Raj.

Seebeck and Peltier are both based on a junction which is formed by two wires of the thermocouple.

And in Thomson effect relates the emf that develops between two parts of the single metal when they are at different temperature.

Current produced due to temperature difference in a Single homogeneous wire is due to thomson effect. If there were two different materials wire then will be seebeck. So the answer is correct.

According to seedbeck due to some temp difference an emf is generated.

Peltier: The produced emf directly proportional to the temperature difference b/w Junctions.