Definition
An electric current that flows continuously in one direction through a circuit, maintaining constant polarity at each terminal. Batteries, photovoltaic panels, and fuel cells produce DC natively; most electronic equipment operates on DC internally. Bulk AC transmission systems use DC only in specialized applications such as high-voltage direct current (HVDC) links for long-distance or asynchronous interconnections, where power electronics convert between AC and DC at each terminal.
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Topic Deck
Electrical Engineering Fundamentals
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Source
FERC Pro Forma OATT / LGIP