19. In her bathroom, Mindy has an overhead heater that consists of a coiled wire made of nichrome that gets hot when turned on. The wire has a length of 3.30 m when it is uncoiled. The heating element is attached to the normal 120-V wiring, and when the wire is glowing red hot, it has a temperature of about 420°C and dissipates 2293 W of power. Nichrome has a resistivity of 108 × 10−8 Ω·m at 20°C and a temperature coefficient of resistivity of 0.00040°C−1. When the heater is first turned on, it has not yet heated up, so it is operating at 20°C. What is the current through the wire when it is first turned on? _____ A
19. In her bathroom, Mindy has an overhead heater that consists of a coiled wire made of nichrome that gets hot when turned on. The wire has a length of 3.30 m when it is uncoiled. The heating element is attached to the normal 120-V wiring, and when the wire is glowing red hot, it has a temperature of about 420°C and dissipates 2293 W of power. Nichrome has a resistivity of 108 × 10−8 Ω·m at 20°C and a temperature coefficient of resistivity of 0.00040°C−1. When the heater is first turned on, it has not yet heated up, so it is operating at 20°C. What is the current through the wire when it is first turned on? _____ A
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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19.
In her bathroom, Mindy has an overhead heater that consists of a coiled wire made of nichrome that gets hot when turned on. The wire has a length of 3.30 m when it is uncoiled. The heating element is attached to the normal 120-V wiring, and when the wire is glowing red hot, it has a temperature of about 420°C and dissipates 2293 W of power. Nichrome has a resistivity of 108 × 10−8 Ω·m at 20°C and a temperature coefficient of resistivity of 0.00040°C−1.
When the heater is first turned on, it has not yet heated up, so it is operating at 20°C. What is the current through the wire when it is first turned on?
_____ A
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