- #1
Karol
- 1,380
- 22
Homework Statement
In metals the resistivity ρ is constant and the resistance R is fixed and doesn't depend on the current, but when i insert the equation of ρ into R i do get a dependence.
Homework Equations
Resistivity is field E divided by current to area: ##\rho=\frac{E}{i/A}##
Resistance: ##R=\frac{\rho L}{A}##
The Attempt at a Solution
$$R=\frac{\rho L}{A}=\frac{E\cdot L}{i}$$