A 330-W heating coil designed to operate from 110 V is made of Nichrome wire 0.720 mm in diameter. (Assume p = 1.50 x 10-6 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 330-W heating coil designed to operate from 110 V is made of Nichrome wire 0.720 mm in diameter. (Assume p = 1.50 x 10-6 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

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 19P

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