Electron drift speed is estimated to be of the order of mm s−1. Yet large current of the order of few amperes can be set up in the wire. Explain briefly.
Electron drift is estimated to be of the order of mm s−1. However, the current set up in the wires is of the order of few amperes. This is because the electron density is very large in a material. It is of the order 1028/m3 of the wire. Hence, all these electrons contribute to the total current. Therefore, despite having small drift speeds, the current set up in wires is large.