A 640-W heating coil designed to operate from 110 V is made of Nichrome wire 0.700 mm in diameter. (Assume p = 1.50 x 10-6 N. m, and a = 4.000 x 10-4(°C)-1 for Nichrome.) (a) Assuming the resistivity of the Nichrome remains constant at its 20.0°C value, find the length of wire used. m (b) Now consider the variation of resistivity with temperature. What power is delivered to the coil of part (a) when it is warmed to 1 200°C? W

A 640-W heating coil designed to operate from 110 V is made of Nichrome wire 0.700 mm in diameter. (Assume p = 1.50 x 10-6 N. m, and a = 4.000 x 10-4(°C)-1 for Nichrome.) (a) Assuming the resistivity of the Nichrome remains constant at its 20.0°C value, find the length of wire used. m (b) Now consider the variation of resistivity with temperature. What power is delivered to the coil of part (a) when it is warmed to 1 200°C? W

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 65PQ

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Question

A 640-W heating coil designed to operate from 110 V is made of Nichrome
wire 0.700 mm in diameter. (Assume p = 1.50 x 10-6 N. m, and
a = 4.000 x 10-4(°C)-1 for Nichrome.)
(a) Assuming the resistivity of the Nichrome remains constant at its
20.0°C value, find the length of wire used.
m
(b) Now consider the variation of resistivity with temperature. What
power is delivered to the coil of part (a) when it is warmed to 1 200°C?
W

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