Principle of operation of a thermocouple:

Thermocouple refers to a temperature sensor which works on the principle that the joining of two dissimilar metals at different temperatures causes a small DC voltage to be generated.

In other words, the generated DC voltage is proportional to the difference in temperatures between the hot and cold junction of a thermocouple.

The hot junction refers to the junction where the two metals A and B are joined...

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Solution Summary: The author explains the principle of operation of a thermocouple, stating that the generated DC voltage is proportional to the difference in temperatures between the hot and cold junctions.

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