# Current Density

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Related to Current Density: conductivity, Drift velocity

## Current density

A vector quantity equal in magnitude to the instantaneous rate of flow of electric charge, perpendicular to a chosen surface, per unit area per unit time. If a wire of cross-sectional area A carries a current I, the current density J is I/A. The units of J in the rationalized meter-kilogram-second system are amperes per square meter.

## Current Density

a vector quantity whose magnitude is equal to the electric charge flowing per unit time per unit area, where the area is perpendicular to the direction of motion of the charge. If the charge density (the charge per unit volume) is equal to ρ, then the current density is j = ρv, where v is the average velocity of the ordered flow of the charges. When the distribution of the current density is uniform over the cross section of the conductor, the current I is equal to jS, where S is the cross-sectional area of the conductor.

## current density

[′kər·ənt ‚den·səd·ē]
(electricity)
The current per unit cross-sectional area of a conductor; a specialization of the physics definition. Also known as electric current density.
(physics)
A vector quantity whose component perpendicular to any surface equals the rate of flow of some conserved, indestructible quantity across that surface per unit area per unit time. Also known as current.
References in periodicals archive ?
The obtained results indicated that with an increase in electrolyte concentration, the ohmic resistance of the solution decreases leading to lower current density needed for reaching optimal applied voltage and lower energy consumption.
4 shows the distribution of instantaneous values of the module of the current density vector in a three-dimensional laminated model (Fig.
In his earlier paper Scott  showed that the oscillations in the [J.sub.1] Bessel function that controls the spatial behavior of the current density component, [j.sub.[theta]], in a Birkeland Current produces counter-rotating bands in its cross-section (and presumably also in the galaxy it flows into).
In this study, direct interaction of BOx on hematin modified MWCNT is capable of increasing the current density driven by a combination of synchronous effect of natural substrate and favorable orientation for BOx.
That is to say, the results are in agreement with the distribution of current density maps (Figure 5(a)).
The analysis of the current density distributions was articulated in three distinct phases, corresponding to different scenarios and stimulation settings as summarized in Figure 3.
A nonparametric local-linear regression model was used to analyze correspondence between both raw and logged current density distributions in the eye, medial walls of the occipital lobe and the remainder of the occipital lobe, and subject ratings.
During the EC experiment, the effects of pH, current density, time and temperature were studied.
One can notice that, the current density changes as the roughness factor increases, i.e.
Since it is an air breathing PEM fuel cell stack, continuous operation with lower current density is limited by the liquid water formation and continuous operation with higher current density is affected by dehydration.
After that, the load was applied on the stack at a specific current density. The fan speed is modified to keep the stack temperature constant.
In addition, it is necessary to popularize the method with which problems can be studied by building simulation models because it is more convenient to change parameters and view the current density and flux density which are not easy to achieve in practical experiments.

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