What is the current density?
The term "density" in general means a value that is divided over either a length, area, or a volume. Densities are useful in summarizing the total charge, current, mass, or whatever that is present in a distribution. While the ratio of the quantity over the region of space may seem unimportant, many fields of physics use these densities:
Answer and Explanation:
Current density is basically the current flowing through a wire divided by the cross-sectional area of the wire. While dividing the current by the area seems to have no merit, current density actually has a pivotal role in determining the electric field that is present in wires as well as the drift velocity of electrons in the wire. A current density is also useful in calculating magnetic fields as we can only derive the current enclosed in a specific section of a wire by using the current density.
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from CLEP Natural Sciences: Study Guide & Test PrepChapter 6 / Lesson 7