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A thermocouple generates an emf because of

  • A.the Seebeck effect at a junction of two dissimilar metals
  • B.the change of resistance of each of the two metals with temperature
  • C.the expansion of one metal relative to the other as they are heated
  • D.the Hall effect produced by the current flowing in the loop

Answer: A

Two dissimilar conductors joined at two junctions at different temperatures drive a current round the loop, and the emf depends on the pair of metals and on the two temperatures. The Peltier and Thomson effects are the reverse and complementary phenomena.

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