FTP, name this electromagnetic quantity, a measure of how strongly an arbitrary quantity of a given material opposes current flow.
Electron-phonon interactions cause this quantity to increase with temperature roughly linearly in most metals and to decrease exponentially in semiconductors. It is the ratio between the electric field and the current density when the material in question is isotropic, and the ideal approximation assumes that this quantity is zero. A related quantity is calculated by its product with length over cross-section. FTP, name this electromagnetic quantity, a measure of how strongly an arbitrary quantity of a given material opposes current flow.
Electron-phonon interactions cause this quantity to increase with temperature roughly linearly in most metals and to decrease exponentially in semiconductors.
{resistivity}