# A question on electric current's density & flow.

1. Feb 7, 2015

### neomahakala108

is this true? thanks for help.

i wished to abstract (generalize on topic) from electric current in physical wires, to for example in air.

i hope this is in proper forum section.
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Electric current's density J depends on electric current's intensity I measured in (A) & on conductor wire's gauge S measured in mm2.

It is described by a physical formula:

J = I / S,

where:
- J is electric current's density, measured in A / mm2,
- I is electric current's intensity, measured in A,
- S is conductor wire's gauge, measured in mm2.

As electrons flow between two points with different electric potential (amount of electrons & positrons in an atom), physical medium resists their flow & gets heated.

Amount of heat depends on:
- conductor wire's gauge, measured in mm2 - the more matter the less heat,
- electric intensity - the more amperes the more heat,
- conductor wire's material - the more resistance the more heat.

in thinner conductor wires, electrons flow faster.

Last edited: Feb 7, 2015
2. Feb 7, 2015

### Svein

Heat = $rI^{2}$. Power transmitted = U⋅I.