Choose which of the following relationships is important for metals as temperatures rise?

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Resistivity rises and conductivity falls

Resistivity falls and conductivity rises

Resistivity and conductivity do not change with temperature

Non-linear temperature dependency

answer is A.

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Detailed Solution

Solution:

Concept: The electrical resistivity of conductor material is a measure of how strongly it resists the flow of electric current through it. This resistivity factor, also known as its "specific electrical resistance," allows the resistance of different types of conductors to be compared at a given temperature based on their physical qualities rather than their lengths or cross-sectional areas.

With increasing temperature, a metal's resistance rises while its conductivity falls. As the temperature rises, the free electrons collide with the metal ions more frequently. The average collision time decreases as well.

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