An external circuit provides a path for the electrons to return to the p-type material, producing an electric current along the way that continues as long as light strikes the solar cell.
此时接上一条外线电路，电子便通过线路流动到p层。只要光束持续地撞击太阳能电池，就会有持续的电流。
In electric railway track circuit, the two steel tracks are both transmission line of the track signal and return line for electric locomotive tractive current back to electric substation.
在电气化铁路轨道电路中，两条钢轨即是轨道信号的传输线，又是电力机车牵引电流返回变电所的回流线。
Based on the ampere return circuit theorem, gauss theorem and charge conservation law the concrete form of displacement current is derived. The displacement current is discussed.
本文从安培环路定理、高斯定理及电荷守恒定律出发导出了位移电流的具体形式。并对位移电流作了简单的讨论。
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