Question

A thermocouple is made from copper and iron. at the hot junction, the current

• A. flows from copper towards iron.
• B. flows from iron towards copper.
• C. flows decreases.
• D. flow increases.

Answer 1

Answer: (A)

flows from copper towards iron.

The positive and negative terminals of a thermocouple are determined by the covalency of the element, that is, whether it will give away or absorb electrons.

Since iron is more electropositive, it will lose the electron and copper would gain. Hence current would flow from copper towards iron.