Question

What is the difference between current and current density?

Short answer

Charge moves through a wire at a rate known as current.

The density of current flow within the conductors is called current density$J=\frac{I}{A}.$

Step-by-step solution

Concept Introduction

A conductor's current is defined as the rate at which electric charges flow through it. Current density is defined as the volumetric flow of charge per unit area through a conductor.

Explanation (Part a)

Difference between current and current density:

The current flow is sustained by an established electric field.

$I=\frac{q}{t}$

Here, $I$is current in Ampere, $q$is charge in Coulomb, and $t$is time in seconds.

The current density written as follows.

$J=\frac{I}{A}$

Here, $J$is current density in $\mathrm{A}/{\mathrm{m}}^2,I$is current in Amperes, and $A$is area of conductor in ${\mathrm{m}}^2.$

Final Answer

Hence, In conductors, the current density can be defined as the density of current flow within the conductors. A stable current means that its magnitude and direction will always remain the same.