DC circuitsQuestion 356 of 1506

A thermocouple in a furnace makes electrical force by which method?

  1. Light on a semiconductor
  2. Heating two unlike metals joined together
  3. Squeezing a crystal
  4. A chemical reaction in an electrolyte
Show answer

Correct answer: Heating two unlike metals joined together

Heat on a junction of unlike metals generates a small EMF.

Source: Electrical Fundamentals Competency (Industry Training Authority of BC), 1.1: Basic principles

Practice dc circuits

Questions last reviewed: 18 October 2026