Current density
Amount of charge flowing through a unit cross-sectional area per unit time / From Wikipedia, the free encyclopedia
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This page is about the electric current density in electromagnetism. For the probability current density in quantum mechanics, see Probability current.
In electromagnetism, current density is the amount of charge per unit time that flows through a unit area of a chosen cross section.[1] The current density vector is defined as a vector whose magnitude is the electric current per cross-sectional area at a given point in space, its direction being that of the motion of the positive charges at this point. In SI base units, the electric current density is measured in amperes per square metre.[2]
Quick Facts Common symbols, In SI base units ...
Current density | |
---|---|
Common symbols | j →, J |
In SI base units | A m−2 |
Dimension | [A L−2] |
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