A tungsten wire is 28m long and is used in a toaster at 120V. The resistivity of this material is 5.6*10^-8 ohm*m. The radius of the wire is 2.5*10^-4 m. a) What is the resistance of the wire? b) How much energy is delivered to the tungsten wire in 30s?

A tungsten wire is 28m long and is used in a toaster at 120V. The resistivity of this material is 5.610^-8 ohmm. The radius of the wire is 2.5*10^-4 m. a) What is the resistance of the wire? b) How much energy is delivered to the tungsten wire in 30s?

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter28: Current And Resistance

Section: Chapter Questions

Problem 67PQ

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Question

A tungsten wire is 28m long and is used in a
toaster at 120V. The resistivity of this
material is 5.6*10^-8 ohm*m. The radius of
the wire is 2.5*10^-4 m.
a) What is the resistance of the wire?
b) How much energy is delivered to the
tungsten wire in 30s?

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