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It is hardly possible to overestimate the importance of power supplies in modern engineering and electronics. Such equipment allows the transformation and transmission of electrical power within an appropriate format depending on its.application to a particular device. However, such concepts of electricity as alternating current (AC) or direct current (DC) power supply are important for both active people and professionals alike in the area. The present paper sets out to do just that: describe the operational principles, advantages, and typical applications of two of the most important power supply units - AC and DC.