Reading My Notes o Ask Your Teacher a. O points oscoPhys2016 203 WA 022 A resist

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Reading My Notes o Ask Your Teacher a. O points oscoPhys2016 203 WA 022 A resistor made of Nichrome wire is used in an application where its resistance cannot change more than 2.00% from its value at 20.0ac, over what temperature range can it be used? The temperature coefficient of resistivity for Nichrome is 0.4 x 10 (ac) Ask Your -1 points oscoPhys2016 203 WA023 A jeweler uses a draw plate to stretch a wire to seven times its original length. By what factor does its resistance increase? Submt Assgnment Save Assignment Progress Home My Assignments Extension Requesf

Explanation / Answer

9)We know that,

resistance is given by:

R = rho L/A

R' = rho (7L)/A

R'/R = rho (7L)/A x A/rho L = 7

R' = 7R

The resistance increases by a factor of 7.

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