Here o is the conductivity of the material. (see Table 5-1 for various common materials. Microscopically speaking, current in conductor forms due to the drift of conduction electrons =ne, where n--the conduction electron density the magnitude of the electron charge, the drift velocity of the electron charge For example, in copper, n=8.5 x 102elctron/M if =100 A/M, then the drift velocity ==74×10-5M/s~0.26M/h en he drift velocity is low different from thermal motion( 10 M s