Experimental studies of the electrical conductivity of whole berries, peels, and pulp of apples and grapes were carried out according to the methods that the measurement voltage should not exceed the threshold and the measurement time should be minimal, and mechanical damage to the cells during contact with the electrodes was not allowed. To study the electrical conductivity (electrical resistance) of apples, grapes, and their constituent elements, a device is developed that represents a three–electrode system. The study of the specific volume resistance of the pulp of apple and grape. Development of a methodology for a three–electrode system to determine the electrical conductivity of the pulp and skin of fruits and grapes. Three–electrode system showed sufficient accuracy for apple and grape the electrical conductivity. The volumetric resistance of the skin was much greater than the pulp. The tissue resistance of fruits and grapes with an increase in the frequency of the measuring current decreases exponentially.

In order to improve the energy characteristics for low-power ozone generators, it is proposed to use a continuous discharge burning mode. It is due to a significant phase shift between the currents and voltages on the ozone generator. Conditions for conducting the continuous discharge mode were identified.

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The article highlights the methodology for quantifying energy efficiency and the principles of using renewable energy sources in the processes of production of final products of the agricultural sector. Domestic and foreign scientists carried out a large number of fundamental and applied research aimed at increasing energy efficiency and reducing the energy intensity of agricultural production and certain positive results have been achieved [3]. We have developed a scientific and methodological basis for increasing energy efficiency in agricultural production. considering the energy technological process and the energy source in a single system, “energy resources-bio object” using the laws of conservation, movement, and absorption of energy [4] New indicators and criteria for evaluating the energy efficiency of agricultural products such as bioenergy efficiency coefficient and useful coefficient of energy use, taking into account the biological characteristics of agricultural energy consumers (technological facilities) [5, 6]. New electrical technologies for the processing and storage of agricultural materials and products, disinfection of water, and other biotechnological objects with the use of electrophysical and electrochemical effects [7, 8] were developed.

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