The resistivity of a metal increases slightly with increased temperature. This can be expressed as rho= rho0[1+α(T−T0)] , where T0 is a reference temperature, usually 20°C, and α is the temperature coefficient of resistivity. For copper, α = 3.9× 10−3 ° C−1. Suppose a long, thin copper wire has a resistance of 0.25 Ω at 20°C.
At what temperature, in °C, will its resistance be 0.31 Ω?
Answers: 1
=Resistance of wire at Temperature T
= Resistivity at temperature T ![=\rho_0 \ [1 \ + \alpha\ (T-T_0\ )]](/tpl/images/0576/4936/cce31.png)
![\frac{0.25}{0.31}=\frac{1}{[1+\alpha(T-20)]}](/tpl/images/0576/4936/a84e2.png)
Other questions on the subject: Physics
Physics, 21.06.2019 19:00, simegustachocolate
Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.
Answers: 2
Physics, 22.06.2019 03:30, Bryanguzman2004
Two polarizers are oriented at 24.0∘ to one another. light polarized at a 12.0-degree angle to each polarizer passes through both. what is the transmitted intensity (%)?
Answers: 2
Physics, 22.06.2019 05:40, thomasalmo2014
Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.
Answers: 3
Do you know the correct answer?
The resistivity of a metal increases slightly with increased temperature. This can be expressed as r...
Questions in other subjects:
History, 10.11.2021 20:00
Mathematics, 10.11.2021 20:00
Mathematics, 10.11.2021 20:00
