Question

What is thermocouples? give it's use

Answer 1

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A thermocouple is an electrical device consisting of two dissimilar electrical conductors forming electrical junctions at differing temperatures. ...Thermocouples are a widely used type of temperature sensor.

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Answer 2

A thermocouple is an electrical device consisting of two dissimilar electrical conductors forming electrical junctions at differing temperatures. ... Thermocouples are a widely used type of temperature sensor.
  Thermocouples are temperature sensors that are made from two metal alloys. When the two metals are brought together to form a junction, a voltage is generated when there are temperature differences between them. This is known as the Seebeck effect.
Thermocouples are widely used in science and industry.