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This is related to the electrical concept of resistance, but in the equation of resistance

$$R = \frac{ρ l}{A}$$

there's the cross-sectional area $A$ of the conductor.

Now if the conductor is a grating

enter image description here

then what's the cross-sectional area of such "flat" object? Is it the area of the object itself?

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mavavilj
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1 Answers1

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This is the second Ohm's law.

It's related to electric wires.

$A$ would be the section of the wire, which is usually the area of a circumference.

I believe your question is meaningless since you're understanding $A$ as the normal area of a geometric shape.

That law is related to electric wires.

Enrico M.
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  • What's the area of a circumference? Isn't circumference only a property of circles? – mavavilj Sep 23 '16 at 12:42
  • @mavavilj Sorry, in Italian we indicate "circumference" as a synonym of "circle" and I forgot that it's technically the name of the area of the circle instead :D – Enrico M. Sep 23 '16 at 12:57