The conversation between human and AI assistant.
Is the entropy change of a cyclic device always zero, whether it's reversible or irreversible?
How is the entropy change related to the efficiency of a cyclic device?
The efficiency of a cyclic device is related to the ratio of the work done by the device to the heat absorbed during the cycle. The maximum efficiency of the device is given by the Carnot efficiency, which is equal to 1 minus the ratio of the temperatures of the heat reservoirs used in the cycle.