Physics Practice Problems Resistors and Ohm's Law Practice Problems Solution: Which of the following materials is the poorest el...

Solution: Which of the following materials is the poorest electrical conductor?A. NichromeB. CopperC. Aluminum D. Brass 

Problem

Which of the following materials is the poorest electrical conductor?

A. Nichrome

B. Copper

C. Aluminum 

D. Brass 

Solution

It's hard to find a table of conductivity of metals in a physics textbook, but many list values of resistivity, ρ, for at least a few metals. Remember resistivity is the inverse of conductivity (a more resistive material will be less conductive.)

Copper has one of the lowest resistivities (1.47×10−8 Ω·m)—it's a very good conductor. B is incorrect.

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