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which causes an air conditioner to turn on?
house-temperature decreases cause the bimetallic coil to expand or contract.
house-temperature decreases cause the bimetallic coil to return to normal.
house-temperature increases cause the bimetallic coil to expand or contract.
house-temperature increases cause the bimetallic coil to return to normal.

House temperature increases cause the bi metallic strip to expand or contract.

Explanation:

A bimetallic strip is used in the heat dependent switches like the one used in air conditioners. Once the temperature changes, the lengths of the two types of metal making the strip change in different ratios thus bending to make the contact thus turning the air conditioner on.

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