Current density or electric current density is defined as the amount of electric current that passes through the unit cross-sectional area of the conductor.
Current density formula:
Current density (J) = I/A
I = Electric current
A = Area of crosssection
The current density formula is used to determine the amount of current in a specific portion of the conductor.
Current density in terms of electric field and conductivity.
J = σ E
J = Current density
σ = Conductivity
E = Electric field intensity.
The SI Unit is Ampere meter ^-2.
Dimensional formula is [AT^-2].
Summary:
Reference Source:
[1] Current Density – Definition, What is Current, Types of Current, Formula, Solved problems, and FAQs. BYJUS. Published August 28, 2018. Accessed March 11, 2022. https://byjus.com/physics/current-density/
[2] Toppr-guides. Toppr-guides. Published November 4, 2019. Accessed March 11, 2022. https://www.toppr.com/guides/physics-formulas/current-density-formula/
[3] Vedantu. Current Density Formula. VEDANTU. Published June 22, 2021. Accessed March 11, 2022. https://www.vedantu.com/formula/current-density-formula
[4] Current Density in Metal and Semiconductor | Electrical4U. Electrical4U. Published February 24, 2012. Accessed March 11, 2022. https://www.electrical4u.com/current-density-in-metal-and-semiconductor/