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。
Electric current gradient process was a new technique for testing the external coatings of the underground pipelines.
电流梯度法是一种地下管道外防护层检测的新技术。
Based on the discreteness of electric charge, the influences of an external magnetic filed on the persistent current of the mesoscopic coupling metallic rings a re investigated.
在考虑电荷是量子化的基础上，研究了外加磁场对介观耦合金属环中持续电流的影响。
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