State the main points of the second law of thermodynamics.

(N/A) The second law of thermodynamics can be stated through two primary perspectives:
$1$. Kelvin-Planck Statement: It is impossible for any device that operates on a thermodynamic cycle to receive heat from a single reservoir and produce a net amount of work. In other words,$100\%$ conversion of heat into work is impossible.
$2$. Clausius Statement: It is impossible to construct a device that operates in a cycle and produces no effect other than the transfer of heat from a lower-temperature body to a higher-temperature body without the application of external work.