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PHYSICS
Electricity
Direct Current
Direct current powers everything from your smartphone to electric cars with a steady, unidirectional flow
7 Feb 2026
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What key characteristic distinguishes direct current (DC) from alternating current (AC)?
DC reverses direction periodically while AC flows in a constant direction.
DC can only flow through wires, unlike AC which can flow through semiconductors and vacuums.
DC flows in a constant, single direction while AC reverses direction periodically.
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