Deriving Units for Current Density - J=I/A Length

[AGGENGR]

Just trying to derive the units for current density but i keep getting A*m rather than A/m^2.

J = I/A

A length derivation would help.

 

[Orodruin]

What are the units of I and A? ...

 

[AGGENGR]

Units of A: C/S
Units of I: A

 

[mfb]

How do you get A*m? Where does that come from?

Be careful with the letter A here, it can represent Amperes (as unit) and an area (as symbol).

 

[AGGENGR]

Ok i actually see what i was doing wrong. Just a bad algebra error. Thanks!