Current



adjective
1.
passing in time; belonging to the time actually passing:
the current month.
2.
prevalent; customary:
the current practice.
3.
popular; in vogue:
current fashions.
4.
new; present; most recent:
the current issue of a publication.
5.
publicly reported or known:
a rumor that is current.
6.
passing from one to another; circulating, as a coin.
7.
Archaic. running; flowing.
8.
Obsolete. genuine; authentic.
noun
9.
a flowing; flow, as of a river.
10.
something that flows, as a stream.
11.
a large portion of air, large body of water, etc., moving in a certain direction.
12.
the speed at which such flow moves; velocity of flow.
13.
Electricity. electric current.
14.
a course, as of time or events; the main course; the general tendency.
adjective
1.
of the immediate present; in progress: current events
2.
most recent; up-to-date
3.
commonly known, practised, or accepted; widespread: a current rumour
4.
circulating and valid at present: current coins
noun
5.
(esp of water or air) a steady usually natural flow
6.
a mass of air, body of water, etc, that has a steady flow in a particular direction
7.
the rate of flow of such a mass
8.
(physics) Also called electric current

a flow of electric charge through a conductor
the rate of flow of this charge. It is measured in amperes I

9.
a general trend or drift: currents of opinion

current cur·rent (kûr’ənt, kŭr’-)
n.

A stream or flow of a liquid or gas.

Symbol I A flow of electric charge.

Symbol I, i The amount of electric charge flowing past a specified circuit point per unit time.

current
(kûr’ənt)

A flowing movement in a liquid, gas, plasma, or other form of matter, especially one that follows a recognizable course.

A flow of positive electric charge. The strength of current flow in any medium is related to voltage differences in that medium, as well as the electrical properties of the medium, and is measured in amperes. Since electrons are stipulated to have a negative charge, current in an electrical circuit actually flows in the opposite direction of the movement of electrons. See also electromagnetism, Ohm’s law. See Note at electric charge.

Our Living Language : Electric current is the phenomenon most often experienced in the form of electricity. Any time an object with a net electric charge is in motion, such as an electron in a wire or a positively charged ion jetting into the atmosphere from a solar flare, there is an electric current; the total current moving through some cross-sectional area in a given direction is simply the amount of positive charge moving through that cross-section. Current is sometimes confused with electric potential or voltage, but a voltage difference between two points (such as the two terminals of a battery) means only that current can potentially flow between them; how much does in fact flow depends on the resistance of the material between the two points. Electrical signals transmitted through a wire generally propagate at nearly the speed of light, but the current in the wire actually moves very slowly: pushing electrons into one end of the wire is rather like pushing a marble into one end of a tube filled with marbles—a marble (or electron) gets pushed out the other end almost instantly, even though the marbles (or electrons) inside move only incrementally.

electronics
The quantity of charge per unit time, measured in Amperes (Amps, A). By historical convention, the sign of current is positive for currents flowing from positive to negative potential, but experience indicates that electrons are negatively charged and flow in the opposite direction.
(1995-10-05)

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