February 21, 2017

Homework Help: Physics

Posted by Trace on Wednesday, November 17, 2010 at 11:45pm.

A copper wire has a resistance of 24 Ω at 20°C. An aluminum wire has three
times the length and twice the radius of the copper wire. The resistivity of copper is 0.6 times that of
aluminum. Both Al and Cu have temperature coefficients of resistivity of 0.004°C–1.

What is the resistance of the aluminum wire at 20 degrees C?

please help me I have no idea what to do. I know that I should use R=p(L/A), but I'm not even sure where to start.

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