Intuitive thermodynamics of energy-conversion

Several extensive properties flow through an energy-converter-for example momentum, moment of momentum, electricity, entropy, mass-which are entering and leaving the converter with different corresponding potations-for example velocity, angular velocity, electric and chemical potential, temperature. With every flow of property there is connected an energy-flow of a certain form, which is the product of potential and flow of property. Energy is transferred from one stream of property to another, i.e. energy is converted from one form to an other. (orig.)