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Current (I) is measured in amperes, which is an SI Base Unit, defined in terms of the force (expressed in newtons) between two, parallel, current-carrying conductors.

Current is the rate at which electric charge (Q) flows. Electric charge is measured in coulombs, which is an SI Derived Unit, defined in terms of current and time (t) the ampere and the second. That is: Q = I t.

So a 'coulomb' is a special name given to an 'ampere second'.

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10y ago
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15y ago

In a conductor, we examine current flow using (among other things) current density. We look at the amount of current (I) in that conductor, and we consider the cross-sectional area (A) of that conductor. When we have the current and that cross-sectional area, we can find the "current per unit of area" that is flowing in the conductor. We call that current per unit area the current density (J), and it is expressed as follows: J = I/A

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Q: What is the relationship between current and current density?
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