Which sentence best describes a refrigerator?
A.
It extracts heat from a high-temperature system and loses the heat to a low-temperature system.
B.
It extracts heat from a high-temperature system, loses some of the heat to a low-temperature system, and does work at its output.
C.
It extracts heat from a low-temperature system using work at its input, and rejects heat to a high-temperature system.
D.
It extracts heat from a low-temperature system and retains all the heat.

The statement 'it extracts heat from a low-temperature system using work at its input, and rejects heat to a high-temperature system' BEST describes a refrigerator (Option C).

A refrigerator is a commercial device that transfers heat to the environment so its internal compartment is cooled, thereby keeping foods and drinks cool.

This device (refrigerator) maintains things cool by pushing a refrigerant (i.e., a liquid) through a sealed thermally insulated system.

In consequence, a refrigerator can also be considered as a storage system that maintains foods to a suitable temperature.

In conclusion, the statement 'it extracts heat from a low-temperature system using work at its input, and rejects heat to a high-temperature system' BEST describes a refrigerator (Option C).

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