Electric current density
The electric current density can be defined as the amount of charges crossing a unit area of cross-section per unit time.
Symbol: J
SI of Measurement: A m−2 (ampere per square meter)
Mathematical Expression

References:
- Electric Current and Current Flow – Electrical Classroom
- https://en.wikipedia.org/wiki/Current_density
- https://www.bipm.org/documents/20126/41483022/si_brochure_8.pdf