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

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)...

See similar textbooks

Similar questions

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?
A 360-W heating coil designed to operate from 110 V is made of Nichrome wire 0.510 mm in diameter. (Assume p = 1.50 x 10-6 2. 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. (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? Need Help? Read It
A 560-W heating coil designed to operate from 110 V is made of Nichrome wire 0.640 mm in diameter. (Assume p = 1.50 x 10- 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. (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) A 33.5-m length of copper wire at 20.0°C has a radius of 0.29 mm. If a potential difference of 8.00 V is applied across the length of the wire, determine the current in the wire. (Use the values in the following table.) Resistivitya (0 · m) Temperature Coefficient of Resistivityb a [(°C)-l] Material Silver 1.59 х 10-8 3.8 x 10-3 Copper 1.7 x 10-8 3.9 x 10-3 Gold 2.44 x 10-8 3.4 X 10-3 Aluminum 2.82 x 10-8 3.9 x 10-3 Tungsten 5.6 x 10-8 4.5 x 10-3 Iron 10.0 x 10-8 5.0 x 10-3 Platinum 11 x 10-8 3.92 x 10-3 Lead 22 x 10-8 3.9 x 10-3 Nichrome 1.00 x 10-6 0.4 x 10-3 Carbon 3.5 x 10-5 -0.5 x 10-3 Germanium 0.46 -48 x 10-3 Silicond 2.3 x 103 -75 x 10-3 Glass 1010-1014 Hard rubber 1013 Sulfur 1015 Quartz (fused) 75 x 1016 (a) All values at 20°C. All elements in this table are assumed to be free of impurities. (b) See the section "Resistance and Temperature". (c) A nickel-chromium alloy commonly used in heating elements. The resistivity of Nichrome varies with composition and ranges between…
The electrical resistance in ohms of a certain thermometer varies with temperature according to the approximate law :R = Ro [1 + α (T – To )]The resistance is 101.6 Ω at the triple-point of water 273.16 K, and 165.5 Ω at the normal melting point of lead (600.5 K). What is the temperature when the resistance is 123.4 Ω?
A 4 cm long piece of Si with a cross-sectional area of 0.01 cm² is doped with donors at 1016/cm?, and has a resistance of 8 ohms. Calculate the electron drift velocity (cm/s), if we apply a voltage of 80 V across the Si piece. (q = 1.6x10-lº C; o = qnµ; R= pL/A; v= uƐ) !!
When an electric heater is turned on, the Nichrome heating element is at 0° C and draws a current of 18 A, with a potential difference of 120 V between the ends of the element. The element heats up to 795° C, with the potential difference constant. Find the final current. (The temperature coefficient of resistivity of Nichrome is 4.0 10-4 (°C)-1.)
Question 4
A heating element is made by maintaining a potential difference of 89.0 V across the length of a Nichrome wire that has a 4.96 x 10-6 m2 cross section. Nichrome has a resistivity of 5.00 x 10-7 2:m. (a) If the element dissipates 2880 W, what is its length? (b) If 102 V is used to obtain the same dissipation rate, what should the length be? (a) Number Units (b) Number Units
A 220. V potential difference is applied to a space heater that dissipates 440. W during operation.(a) What is resistance during operation?(b) At what rate do electrons flow through any cross-section of the heater element? (c) The space heater has a resistance of 27.5 Ω at 25.0 °C and the temperature coefficient of resistivity is α = 4.50x10^-3 °C^-1. What is the temperature of the space heater internal elements?
(a) A 33.5-m length of copper wire at 20.0°C has a radius of 0.31 mm. If a potential difference of 7.0 V is applied across the length of the wire, determine the current in the wire. (Use the values in the following table.) (b) If the wire is heated to 32.0°C while the 7.0-V potential difference is maintained, what is the resulting current in the wire?
A light bulb filament is made of tungsten wire with a resistivity, at room temperature (20°C), of 5.6 x 10-8 Q.m and a temperature coefficient of 0.0045 (°C)-1 The wire is 50 cm long and has a diameter of 45 Um. (a) What is the resistance of the filament at room temperature (20°C)? (Put this answer in the box) (b) What is the resistance of the filament at a typical operating temperature of 3000°C ? Answer: