Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Current is the amount of charge that passes a point over a certain amount of time. Current density is the amount of current that flows through the cross-sectional area of a wire. Current is measured in amps, while current density is measured in amps per $meter^2$ ($\displaystyle \frac{A}{m^2}$).
Current is the amount of charge that passes a point over a certain amount of time. Current density is the amount of current that flows through the cross-sectional area of a wire. Current is measured in amps, while current density is measured in amps per $meter^2$ ($\displaystyle \frac{A}{m^2}$).