Engineering Thermodynamics
Kelvin Planck's law deals with

Conservation of work
Conversion of heat into work
Conversion of work into heat
Conservation of heat

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Engineering Thermodynamics
According to First law of thermodynamics,

Total internal energy of a system during a process remains constant
Total energy of a system remains constant
Internal energy, enthalpy and entropy during a process remain constant
Work-done by a system is equal to the heat transferred by the system

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