DC

(noun)

Direct current; the unidirectional flow of electric charge.

Related Terms

Examples of DC in the following topics:

  • Different Types of Currents

    • If the sources are constant (DC) sources, the result is a DC circuit.
    • If a capacitor or inductor is added to a DC circuit, the resulting circuit is not, strictly speaking, a DC circuit.
    • However, most such circuits have a DC solution.
    • In electronics, it is common to refer to a circuit that is powered by a DC voltage source such as a battery or the output of a DC power supply as a DC circuit even though what is meant is that the circuit is DC powered.
    • A simple DC circuit is illustrated in .

  • Complement of an event

    • (a) Compute P(Dc) = P(rolling a 1, 4, 5, or 6). ( b) What is P(D) + P(Dc)?
    • Since D and Dc are disjoint, P(D) + P(Dc) = 1.
    • First find P(Dc) = P(11 or 12) = 2/36 + 1/36 = 1/12.
    • Then calculate P(D) = 1 - P(Dc) = 11/12.
    • Event D = {2, 3} and its complement, Dc = {1, 4, 5, 6}.

  • The War in the Chesapeake

    • In response to Prevost's request, the British decided to employ this force, together with the naval and military units already on the station, to strike at Washington, D.C.
    • The British left Washington, D.C. as soon as the storm subsided.
    • The successful British raid on Washington, D.C., dented American morale and prestige.
    • This drawing shows the capture and burning of Washington, D.C. by the British in 1814. 1876 publication.
    • Describe the burning of Washington, D.C. and the subsequent battles of Baltimore and Fort McHenry

  • Resistors and Capacitors in Series

    • An RC circuit has a resistor and a capacitor and when connected to a DC voltage source, and the capacitor is charged exponentially in time.
    • In this Atom, we will study how a series RC circuit behaves when connected to a DC voltage source.
    • Fig 1 shows a simple RC circuit that employs a DC voltage source.
    • where V(t) is the voltage across the capacitor and emf is equal to the emf of the DC voltage source.

  • Resistors in AC Circuits

    • Direct current (DC) is the flow of electric charge in only one direction.
    • Examples include the commercial and residential power that serves so many of our needs. shows graphs of voltage and current versus time for typical DC and AC power.
    • Ohm's law applies to AC circuits as well as to DC circuits.
    • (a) DC voltage and current are constant in time, once the current is established.

  • The Inventions of the Telephone and Electricity

    • In 1882, generation was with direct current (DC), which could not easily be increased in voltage for long-distance transmission.
    • The problem with DC was that power plants could only deliver DC electricity economically to customers within about one and a half miles (about 2.4 km) from the generating station, so that it only was suitable for central business districts.
    • The war against AC involved Edison in the development and promotion of the electric chair (using AC) as an attempt to portray AC as having greater lethal potential than DC.
    • AC eventually replaced DC in most instances of generation and power distribution, enormously extending the range and improving the efficiency of power distribution.
    • Though widespread use of DC ultimately lost favor for distribution, it exists today primarily in long-distance high-voltage direct current (HVDC) transmission systems.

  • Antigen-Presenting Cells

    • Dendritic cells (DCs) phagocytose exogenous pathogens such as bacteria, parasites, and toxins in the tissues and then migrate, via chemotactic signals, to T cell-enriched lymph nodes.
    • During migration, DCs undergo a process of maturation in which they lose phagocytic capacity and develop an increased ability to communicate with T-cells in the lymph nodes.
    • The DC uses lysosome-associated enzymes to digest pathogen-associated proteins into smaller peptides.
    • In the lymph node, the DC will display these antigenic peptides on its surface by coupling them to MHC Class II molecules.

  • Electrolytic Cells

    • In chemistry and manufacturing, electrolysis is a method of using a direct electric current (DC) to drive an otherwise non-spontaneous chemical reaction.
    • A direct current (DC) supply: provides the energy necessary to create or discharge the ions in the electrolyte.

  • Dolley Madison and Washington City

    • Dolley Madison played a major role in establishing the nation's newly created capital city, Washington D.C.
    • The national capital, Washington, D.C., was founded on land given by Maryland on the Potomac River, along the Virginia border.
    • The United States Capitol after the burning of Washington, D.C. in the War of 1812.

  • Stalemate in the Eastern Theater

    • Many of the Civil War's most important and bloodiest battles occurred in the eastern theater between Washington, D.C., and Richmond.
    • The battle began with Confederate Major General Stonewall Jackson’s troops capturing a supply depot at Manassas Junction, which threatened Pope’s line of communication with Washington, D.C.
    • The capitals of Washington, D.C., and Richmond were both attacked or besieged.