Direct current
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Direct current is one-directional flow of electric charge. An electrochemical cell is a prime example of DC power. Direct current may flow through a conductor such as a wire, but can also flow through
Brush Electric Company's central power plant with dynamos generating direct current to power arc lamps for public lighting in New York. Beginning operation in December 1880 at 133 West Twenty-Fifth Street, the high voltages it operated at allowed it to power a 2-mile (3.2 km) long circuit.
Rectifier
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A rectifier is an electrical device that converts alternating current, which periodically reverses direction, to direct current, which flows in only one direction.
Direct current
…simply alternating and direct, as when they modify current or voltage. Direct current may be converted from an alternating current supply by use of a rectifier, which contains electronic elements (usually) or electromechanical elements (historically) that allow current to flow only in one direction. Direct…
A thyristor (silicon controlled rectifier) and associated mounting hardware. The heavy threaded stud attaches the device to a heatsink to dissipate heat.
Disassembled automobile alternator, showing the six diodes that comprise a full-wave three-phase bridge rectifier
A vibrator battery charger from 1922. It produced 6 A DC at 6 V to charge automobile batteries.
A small motor–generator set