It is important that the two metals that compose a bimetallic strip have
A)different conductivities.
B)different rates of expansion.
C)equal thicknesses.
D)all of the above
E)none of the above

Question

Quizplus · Accepted Answer

The purpose of a bimetallic strip is to convert temperature changes into mechanical motion. This is achieved by using two metals with different coefficients of thermal expansion. As the temperature changes, one metal will expand more than the other, causing the strip to bend or curve. Therefore, it is important that the two metals have different rates of expansion, making option B the best choice. Conductivity and thickness are not relevant to the function of a bimetallic strip.

It Is Important That the Two Metals That Compose a Bimetallic