resistance and resistivity

mollykins | 19:19 Wed 18th Nov 2009 | Science

14 Answers

whats the difference between reistsance and resistivity?

ph/ strength of a chemical

Name for special cuboid

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factor-fiction

http://hyperphysics.p...e/electric/resis.html

mollykins

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I don't understand. . . sorry

mollykins

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its a level stuff but my science teacher wants me to include it in my work.

mollykins

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aaarrrggghhh

snags

''resistance and resistivity''

This doesn't have anything to do with the toilet seat thing does it?

mollykins

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no, triple science physics work. how would it have anything to do with the toilet seat problem?

mollykins

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I want to know the difference between resistance and resistivity but all the explanations are complicated and make them sound the same.

mollykins

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were you thinking or the air resistance of pee and its affects on its trajectory and landing site?

mollykins

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and the airs resistitivty.( i can't even spell that word anymore.) and the affects of it on the pee.

Vagrant

In simple terms, resistivity is the resistance of a specific piece of a material (e.g. a piece of wire of a certain cross sectional area).

Imagine a piece of wire, 10 metres long, whose total resistance is 10 ohms.
The resistivity of it is 1 ohm per metre.

mjd

Simply, resistivity is a measure of how strongly a material opposes the flow of an electric current. The relationship between resistance (R) and resistivity (ρ) is:

R = ρ*(L/A) Where L is the length of a conductor and A is its cross sectional area.

-- answer removed --

Teddio

The unit of resistivity is ohm metre not ohm per metre. A 1 metre cube of material will have a resistance equal to its resistivity, if the resistance is measured across opposite faces.

nightmare

Some people seem to be incapable of supplying a simple concise answer to what is a very simple question.
Resistivity is a property of a material. It is a measure of that material's opposition to the flow of electric current.Any object made of that material has exactly the same resistivity.
What does change is the object's resistance, which depends on its length, cross sectional area, etc.
Resistivity is the resistance of a (hypothetical) piece of a substance one unit of length long and of one unit cross sectional area.
Resistance is then resistivity x length / cross section
Hence, the Si unit of resistivity is the ohm metre.

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