einstein101 said:Homework Statement
The resistivity of nichrome wire is 1.1micro ohm meters. What length of wire of diameter 0.079 mm is required to provide resistance of 1.0 Kohm?
Homework Equations
R=resistivity x length/area
The formula for calculating resistivity is ρ = R x A / L, where ρ is the resistivity, R is the resistance, A is the cross-sectional area, and L is the length of the material.
Resistivity is a measure of a material's intrinsic resistance to electric current, while resistance is a measure of how much a material opposes the flow of electric current.
The units of resistivity are ohm-meters (Ω·m) or ohm-centimeters (Ω·cm).
Generally, resistivity increases with an increase in temperature for most materials. This is because as temperature increases, the atoms in the material vibrate more and impede the flow of electrons.
Yes, the resistivity of a material can change depending on factors such as temperature, pressure, and impurities in the material. For example, the resistivity of a metal increases as the temperature increases, but the resistivity of a semiconductor decreases as the temperature increases.