Arizona Drivers License Practice Test

A bimetal thermostat operates based on the principle of:

Unequal expansion of two different metals Change in electrical resistance with temperature Vapor pressure of a volatile liquid Generation of a millivolt signal

Correct Answer:

Unequal expansion of two different metals

Explanation:

A bimetallic strip consists of two metals with different coefficients of thermal expansion, causing it to bend as temperature changes.

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