Resistivity - A Level Physics

If I have two copper wires with the same diameter, but one is longer than the other, you can expect the longer wire to have a higher resistance.
That’s because an electron needs to make its way between more positive ions before it reaches the other end. This means resistance is proportional to the length of wire.
Two wires that have the same length but have different cross-sectional area will have different resistance. The larger the cross sectional area a wire has, the lower the resistance it has. Resistance is inversely proportional to area.
We also need a way to take into account the material's ability to impede the motion of electrons. This is called resistivity.
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[@vt.physics]

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[@vt.physics]

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[@user-cz7mu6et4g]

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[@user-nu5oe7zr9r]

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[@ritinyadav9358]

If resistivity is constant than in the formula rho=(ohm×m2)÷m with any good conductor of material,if we change the length or the cross section area the resistivity is changing

[@MRSENSATIONAL19]

Residents changes with the change in temperature,so if the temperature is constant then the resistivity of a material becomes constant too

[@krishangpallai6734]

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[@Everythingofphysics]

really helpful for CICSE students

[@aliabbassspartacus5949]

Thanks

[@hirastic]

Hello! Thanks for this video ❤️ I wanted to ask a question regarding resistivity. In my textbook it is mentioned that resistivity depends on temperature. However, you have mentioned that resistivity is an intrinsic property and does not depend on the material's geometry. So, why is resistivity being affected by Temperature ?(and also can you explain the term 'geometric property’).

[@shadilkt4103]

Because as temperature increases the collision time b/w free electrons decreases ( we call it as relaxation time). Since resistivity is inversely proportional to relaxation time. When relaxation time descreases resistivity increases. And also the geometric property means the properties that are dependent of geometric dimensions ( like length, area of cross section )

[@WotansKarl]

If only they would publish tables where this info could be looked up at need instead of giving hypothetical materials and resistivities to students to figure out.

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Thanks you

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Maam your vids are really helpfull.......Can u show the derivation of ρ= m/ne²τ

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ty❤

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[@vt.physics]

Most welcome 😊

[@neobokaba5914]

Wow

[@la8155]

I just have one question - why does the resistivity not change? (at the end)

[@vt.physics]

At both ends of the material? The resistivity is a property of the material... regardless of the dimensions.

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❤

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