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Resistance is due to scattering of conduction electrons. A metallic crystal can be viewed simplistically as a periodic array of ions with a cloud of delocalised conduction elections. The electrons do not scatter of the ions themselves because the crystal is periodic. There are two significant causes of scattering: 1. scattering off vibrations of the atomic lattice (phonons). This contribution to the resistivity is proportional to temperature. 2. scattering off defects in the crystal. At low temperature, this is the cause of a finite 'residual resistivity'. The two terms add linearly Rtotal = R1(T) + R2 Cold working a metal will introduce defects and thus lead to an increase in R2. Conversely, annealling the metal at high temperature will remove defects and reduce the residual resistivity.

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16y ago
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13y ago

It is not a right perception to think that alloys have high resistivity.

Alloys can have high resistivity or low resistivity than the actual elements.

You might be thinking that alloys have high resistivity as many resistors are made of alloys. But by altering the composition of elements, we can also make an alloy of very low resistivity.

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13y ago

The presence of impurities and alloying elements decrease the electrical conductivity of most of the metals.. Hence thereby the alloying of metals increase the resistivity of metals and decrease its electrical conductivity..

But rarely.,, certain magnetic alloys increase its conductivity.

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11y ago

because there properties are beter than metals

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Q: Why Alloys of metals have greater resistivity than their constituents?
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Whether the resistivity of copper or its alloy is greater?

Copper alloy is often used in preference to pure copper due to its hardenss. Pure metals are usually soft and can be cut easily. They are not suitable for making any hard bodies. Therefore, alloys are used.

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Resistivity is a constant for any particular material, and independent of that material's physical dimensions or shape. However, it does vary with temperature which is why resistivity is always quoted at a particular temperature. Variations in resistivity due to temperature change is the reason that the resistance of a material varies with temperature. In SI, resistivity is expressed in ohm metres.

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