A 400-W heating coil designed to operate from 110 V is made of Nichrome wire 0.440 mm in diameter. (Assumep 1.50 x 10° n m, and a = 4.000 x 10°C)- 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) whenit is warmed to 1 200°C?W

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Answered: A 400-W heating coil designed to…

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 17CQ: Resistors are commonly rated at 18W,14W,12W ,1 W and 2 W for use in electrical circuits. If a...

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Resistors are commonly rated at 18W,14W,12W ,1 W and 2 W for use in electrical circuits. If a current of1 = 2.00 A is accidentally passed through a R=1.00 resistor rated at 1 W, what would be the most probable outcome? Is there anything that can be done to prevent such an accident?
What current flows through a 2.54-cm-diameter rod of Pure silicon that is 20.0 cm long, when 1.00103 V is applied to it? (Such a rod may be used to make nuclear- particle detectors, for example.)
A 500-W heating coil designed to operate from 110 V ismade of Nichrome wire 0.500 mm in diameter.(a) Assuming the resistivity of the Nichrome remains constantat its 20.0°C value, find the length of wire used.(b) What If? Now consider the variation of resistivity withtemperature. What power is delivered to the coil of part(a) when it is warmed to 1 200°C?
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A 500-W heating coil designed to operate from 110 V is made of Nichrome wire 0.500 mm in diameter. (a) Assuming the resistivity of the Nichrome remains constant at its 20.0°C value, find the length of wire used. (b) What If? 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?
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Given the temperature coefficient of resistivity of a certain wire to be 2 x10−3 (°C)−1.By what factor is the resistance of this wire changed when its temperature is increased from 20.0°C to 96.52 °C?
A 620-W heating coil designed to operate from 110 V is made of Nichrome wire 0.240 mm in diameter. (Assume ρ = 1.50 10-6 Ω · m, and α = 4.000 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. (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?
What voltage is required to be applied during open-heart surgery to utilize a defibrillator for reviving a patient from cardiac arrest, given that the path's resistance is 0.500 kΩ and a current of 12.0-mA is necessary?
Assuming a constant temperature coefficient of resistivity, what is the maximum percent decrease in the resistance of a constantan wire starting at 20.0oC ?

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