I just need a clarification, I have been through a dozen www sites and cannot find an answer(adsbygoogle = window.adsbygoogle || []).push({});

they show how resistivity is worked out eg ....

the Ohm meter is usually shown with a "dot" between Ohm and metre E/J = ρ

As you already read, ρ is the symbol for resistivity. E is the electric field and has units of Volts per meter (V/m). J is the current density and has units of amps per meter squared (A/m2). The electric field is calculated by dividing the Voltage by the length, l, that voltage is applied.

E=V/l

The current density is calculated by the equation below

J=I/A

I is the current and is divided by the cross sectional area, A, over which the current flows.

Is this the same as Ohm times metre ? or Ohms per metre or something else?

I would have thought that Ohms per metre would be Ohms/metre ?

cheers

Dave

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# Resitivity, the Ohm metre

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