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Vector graph or chart of direct current and alternating current isolated on white background. Direct current – voltage is constant. Alternating current – voltage periodically changes. Electricity flow Reflections in downtown Washington, DC. alternating and direct current symbol Direct current graph in electronic Alternating Current 60 Hz A dynamic visualization of high voltage direct current (HVDC) flow, digital models displaying power transmission, direct current and alternating current, Direct current – voltage is constant, Electricity flow, Animated Differences between Alternating Current (AC) and Direct Current (DC) graph showing the variation of current with time for alternating current and direct current The symbols for alternating current (AC) and direct current (DC) DC, direct current electricity generator mechanical principle outline diagram, transparent background. Labeled educational scheme with electrical device structure illustration. Flow of current. Direct current A young man undergoes transcranial direct current stimulation therapy for depressive disorders. The man is on a gray background. Copyspace for advertising.