average electronic velocity.
\item Rewrite the current density using the average electronic velocity
and find an expression for the conductivity $\sigma=1/\rho$.
average electronic velocity.
\item Rewrite the current density using the average electronic velocity
and find an expression for the conductivity $\sigma=1/\rho$.
with the lattice.
Energy is not conserved in the collisions.
Find an expression for the power loss in the considered wire.
with the lattice.
Energy is not conserved in the collisions.
Find an expression for the power loss in the considered wire.