Dc Power

Some articles on power, dc power, dc:

Electric Power System - Basics of Electric Power
... Electric power is the mathematical product of two quantities current and voltage ... can vary with respect to time (AC power) or can be kept at constant levels (DC power) ... air conditioners, pumps and industrial machinery use AC power whereas most computers and digital equipment use DC power (the digital devices you plug ...
Electric Power System - Components of Power Systems - Power Electronics
... Power electronics are semi-conductor based devices that are able to switch quantities of power ranging from a few hundred watts to several hundred megawatts ... The classic function of power electronics is rectification, or the conversion of AC-to-DC power, power electronics are therefore found in almost every digital device that is supplied from an AC ... High-powered power electronics can also be used to convert AC power to DC power for long distance transmission in a system known as HVDC ...
Commutation Cell
... The commutation cell is the basic structure in power electronics ... It is composed of an electronic switch (today a high-power semiconductor, not a mechanical switch) and a diode ... It was traditionally referred to as a chopper, but since switching power supplies became a major form of power conversion, this new term has become more popular ...
AC/DC (electricity) - Current Wars - Remnant and Existent DC Systems
... Some cities continued to use DC well into the 20th century ... In central Helsinki, there was a DC network in existence up until the late 1940s, and in the 1960s, Stockholm's dwindling DC network was eliminated ... A mercury arc valve rectifier station could convert AC to DC where networks were still used ...
Mercury-arc Valve - Applications
... in the 1920s, mercury arc tubes became limited to higher voltage and especially high-power applications ... Applications included power supply for streetcars, electric railways, and variable-voltage power supplies for large radio transmitters ... Mercury-arc stations were used to provide DC power to legacy Edison-style DC power grids in urban centers until the 1950s ...

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