Alalisvoolusüsteem on ühesuunaline elektrivoolusüsteem, seega liigub laeng alati samas suunas, ja erinevalt vahelduvvoolusüsteemidest ei muutu alalisvoolusüsteemides suund ega voolutugevus.
Direct current system is an electric current system that is uni-directional, so the flow of charge is always in the same direction. As opposed to alternating current system, the direction and amperage of direct current systems do not change.
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