   Chapter 17, Problem 28P

Chapter
Section
Textbook Problem

At what temperature will aluminum have a resistivity that is three times the resistivity of copper at room temperature?

To determine
The temperature at which aluminum has three times the resistivity of copper at room temperature.

Explanation

Given Info: Resistivity of aluminum is three times the resistivity of copper at room temperature.

Explanation:

Formula to calculate temperature is

T=T0+(ρal/ρ0al)1αal

• T0 is the room temperature,
• ρal is the resistivity of aluminum at some temperature T ,
• ρ0al is the resistivity of aluminum at room temperature T0 ,
• αal is the temperature coefficient of resistivity of aluminum,

Substitute 20.0°C for T0 , 3(1.7×108Ωm) for ρal , 2.82×108Ωm for ρ0al and 3

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