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Efficiency (efficiency>), the characteristic of system effectiveness (the device, the car) concerning transformation or transmission of energy; is defined by the relation it is useful for the used energy to the total amount of energy received by system; h = is designated by Wpol/Wcym usually.

Distinguish of a separate element (step) of the car or the device and , characterizing all chain of transformations of energy in system. of the first type according to nature of transformation of energy can be mechanical, thermal etc. The general treat the second type, economic, technical, etc. types . General of system is equal to work of private , or of steps.

For environmental protection widely uses the treatment facilities interfering emission in the atmosphere of harmful substances sharply limit use of compounds of the heavy metals added to fuel, develop