Heat engines, as thermal power plants are physical devices that convert thermal energy to mechanical output (which can be transformed into electricity). The mechanical output is called work, and the thermal energy input is called heat. Heat is transferred from the source, through the working body of the engine, to the sink, and in this process some of the heat is converted into mechanical energy (work) by exploiting the properties of a working substance (usually a gas or liquid).
Heat engines, as thermal power plants are physical devices that convert thermal energy to mechanical output (which can be transformed into electricity). The mechanical output is called work, and the thermal energy input is called heat. Heat is transferred from the source, through the working body of the engine, to the sink, and in this process some of the heat is converted into mechanical energy (work) by exploiting the properties of a working substance (usually a gas or liquid).
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