external impressed current

例句：

1. 1. The externalimpressed current is a crucial factor in the operation of the power grid.
   外部感应电流是电网运行的关键因素。
2. 2. The external impressed current can be used to measure the strength of magnetic fields.
   外部感应电流可以用来测量磁场的强度。
3. 3. The external impressed current is often used in electrical engineering to control the flow of electricity.
   外部感应电流常用于电气工程中，以控制电流的流动。