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JAMB Physics 1992 Question 15

Question 15

Thermal Expansion

One of the most important applications of bi-metallic strip is found in the construction of

  1. A.a thermostat
  2. B.an altimeter
  3. C.a thermocouple
  4. D.a hygrometer
Show the answer and explanation

Answer: A (a thermostat)

Explanation

A bimetallic strip bends when heated because its two metals expand differently; a thermostat uses this bending to switch a circuit on and off.