DC Circuit

DC Circuit

Direct current (DC) is the unidirectional flow of electric charge. Direct current is produced by sources such as batteries, thermocouples, solar cells, and commutator-type electric machines of the dynamo type. Direct current may flow in a conductor such as a wire, but can also flow through semiconductors, insulators, or even through a vacuum as in electron or ion beams. The electric charge flows in a constant direction, distinguishing it from alternating current (AC). A term formerly used for direct current was galvanic current.

The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.

Direct current may be obtained from an alternating current supply by use of a current-switching arrangement called a rectifier, which contains electronic elements (usually) or electromechanical elements (historically) that allow current to flow only in one direction. Direct current may be made into alternating current with an inverter or a motor-generator set.

The first commercial electric power transmission (developed by Thomas Edison in the late nineteenth century) used direct current. Because of the significant advantages of alternating current over direct current in transforming and transmission, electric power distribution is nearly all alternating current today. In the mid 1950s, HVDC transmission was developed, and is now an option instead of long-distance high voltage alternating current systems. For applications requiring direct current, such as third rail power systems, alternating current is distributed to a substation, which utilizes a rectifier to convert the power to direct current. See War of Currents.

Direct current is used to charge batteries, and in nearly all electronic systems, as the power supply. Very large quantities of direct-current power are used in production of aluminum and other electrochemical processes. Direct current is used for some railway propulsion, especially in urban areas. High-voltage direct current is used to transmit large amounts of power from remote generation sites or to interconnect alternating current power grids.

Electromagnetism
  • Electricity
  • Magnetism
Electrostatics
  • Electric charge
  • Static electricity
  • Electric field
  • Conductor
  • Insulator
  • Triboelectricity
  • Electrostatic discharge
  • Induction
  • Coulomb's law
  • Electric flux
  • Gauss's law
  • Electric potential energy
  • Electric dipole moment
  • Polarization density
Magnetostatics
  • Ampère's law
  • Magnetic field
  • Magnetization
  • Magnetic flux
  • Biot–Savart law
  • Magnetic dipole moment
  • Gauss's law for magnetism
Electrodynamics
  • Lorentz force law
  • Electromagnetic induction
  • Faraday's law
  • Lenz's law
  • Displacement current
  • Maxwell's equations
  • EM field
  • Electromagnetic radiation
  • Maxwell tensor
  • Poynting vector
  • Liénard–Wiechert potential
  • Jefimenko's equations
  • Eddy current
Electrical Network
  • Electric current
  • Electric potential
  • Voltage
  • Resistance
  • Ohm's law
  • Series circuit
  • Parallel circuit
  • Direct current
  • Alternating current
  • Electromotive force
  • Capacitance
  • Inductance
  • Impedance
  • Resonant cavities
  • Waveguides
Covariant formulation
  • Electromagnetic tensor
  • EM stress–energy tensor
  • Four-current
  • Electromagnetic four-potential
Scientists
  • Ampère
  • Coulomb
  • Faraday
  • Gauss
  • Heaviside
  • Henry
  • Hertz
  • Lorentz
  • Maxwell
  • Tesla
  • Volta
  • Weber
  • Ørsted

Read more about DC Circuit:  Various Definitions, Circuits, Applications

Other articles related to "dc circuit, dc, circuits, circuit":

DC Circuit - Applications
... DC is commonly found in many low-voltage applications, especially where these are powered by batteries, which can produce only DC, or solar power systems, since solar cells can produce only DC ... Most automotive applications use DC, although the alternator is an AC device which uses a rectifier to produce DC ... Most electronic circuits require a DC power supply ...
USA Next - Criticisms
... distance telephone costs as a result of a prior DC Circuit Court ruling ... "We are concerned about the recent development in the DC Circuit Court that over turned what Congress has done in regard to local telephone competition ... According to news reports, AT T opposed the DC Circuit ruling because the decision would impact the company's bottom line ...
Judicial Appointment History For United States Federal Courts - Courts of Appeals - DC Circuit
... Year Appointed by Republicans Appointed by Democrats Vacant BHO GWB 2 GWB 1 WJC 2 WJC 1 RWR 2 RWR 1 JEC RMN /GRF RMN 1 LBJ JFK /LBJ current 11 5 3 3 - 3 - - 3 1 1 - - - - - - 2008* 11 6 3 2 - 3 - - 3 1 2 - - - - - - 12 ... 5 4 3 - - 1 - 3 2 2 - 1 - - - - 12 ... 5 4 3 - - - - 3 2 3 - 1 - - - - 12 ... 6 5 1 - - - - 3 2 4 - 2 - - - - 12 ... 7 4 1 - - - - - 2 5 - 4 - - - - 12 ... 6 5 1 - - - - - - 5 1 4 - - 1 - 12 ... 3 7 2 - - - - - - - 3 4 - - 2 1 11 ... 3 8 - - - - - - - - - 4 - 3 2 2 SEC. 509 ...
Recreational Vehicle - Terms
... with a disconnect turned off, that battery circuit is 'dead' and no power will be available from the batteries ... engine to house battery.) The isolator also prevents power use by the circuits drawing on the house battery from also draining the engine or vehicle battery ... (shore power) or generator and converts that power to 12 volts DC for use in the vehicle ...
Electronic Component - Classification
... However, electronic engineers who perform circuit analysis use a more restrictive definition of passivity ... it is convenient to ignore the so-called DC circuit and pretend that the power supplying components such as transistors or integrated circuits is absent (as if each such component had its own battery built ... Then, the analysis only concerns the AC circuit, an abstraction that ignores DC voltages and currents (and the power associated with them) present in the real-l ...

Famous quotes containing the word circuit:

    We are all hostages, and we are all terrorists. This circuit has replaced that other one of masters and slaves, the dominating and the dominated, the exploiters and the exploited.... It is worse than the one it replaces, but at least it liberates us from liberal nostalgia and the ruses of history.
    Jean Baudrillard (b. 1929)