6.A nichrome wire and an aluminum wire, each with the same initial resistance, have thesamechange in resistancewhenheated separately. (Pa= 282x 10 2-m;a= 3.9x10/°C; Paichrom150x10 2-m; adehrom0.40x 10/C.) The ratio of thetemperature change of the nichrome wire to the temperature change of the aluminum wireisf the notential difference across

Given: Resistivity constant and thermal constant of Nichrome and aluminum wire are as follows,…

6 A nichrome wire and an aluminum wire, each with the same initial resistance, have the same change in resistance when heated separately. (PA = 282x 10 2-m; %D a=3.9x 10/°C; Paichrom=150x 10 2-m; atehrom04 Ox 10/°C.) The ratio of the temperature change of the nichrome wire to the temperature change of the aluminum wire %3D

6 A nichrome wire and an aluminum wire, each with the same initial resistance, have the same change in resistance when heated separately. (PA = 282x 10 2-m; %D a=3.9x 10/°C; Paichrom=150x 10 2-m; atehrom04 Ox 10/°C.) The ratio of the temperature change of the nichrome wire to the temperature change of the aluminum wire %3D

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 12P

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When a straight wire is heated, its resistance changes according to the equation R = R0 [1 + (T T0)] (Eq. 17.7), where is the temperature coefficient of resistivity. (a) Show that a more precise result, which includes the length and area of a wire change when it is heated, is R=R0[1+(TT0)][1+(TT0)][1+2(TT0)] where is the coefficient of linear expansion. (See Topic 10.) (b) Compare the two results for a 2.00-m-long copper wire of radius 0.100 mm, starting at 20.0C and heated to 100.0C.
When a straight wire is heated, its resistance changes according to the equation R = R0 [1 + (T T0)] (Eq. 17.7), where is the temperature coefficient of resistivity. (a) Show that a more precise result, which includes the length and area of a wire change when it is heated, is R=R0[1+(TT0)][1+(TT0)][1+2(TT0)] where is the coefficient of linear expansion. (See Topic 10.) (b) Compare the two results for a 2.00-m-long copper wire of radius 0.100 mm, starting at 20.0C and heated to 100.0C.
How much would you have to raise the temperature of a copper wire (originally at20◦C) to increase its resistance by 15 % ? (i.e. ∆T = ?)(a) 39◦C (b) 49◦C(c) 59◦C(d) 69◦C(e) None of the above
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1. The resistance of a rod with a length of 3.0 m and a diameter of 1.0 cm is 56. 0 ohms. If this rod is stretched to form a wire with a diameter of 0.01 cm, what is its resistance? Assume that in the process of stretching the rod, its volume did not change. 2. A copper wire has a resistance of 15.0 ohms at a temperature of 14°C. After a current passes through the windings, the resistance rose to 12.5 ohms. To what temperature was the wire heated
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The thermal coefficient of resistivity of iron is alpha = 5.0 x 10 ^ (- 3 / ° C), that of carbon is alpha = - 0.50 x 10 ^ (- 3 / ° C) When an iron wire and a carbon bar , both with a resistance of 10 Ω at 20 ° C, cool down to a temperature of -80 ° C, the new relationship between the resistance of the carbon rod and that of the iron wire at the lowest temperature is a.+1.9 b.-0.10 c.-10 d.+2.1 e.+10
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