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。
To do this, the designer must be certain of the actual path that the return current takes in getting back to the signal source.
要做到这一点，设计者必须掌握电流的实际流向和返回信号源的路径。
To do this, the designer must be certain of the actual path that the return current takes in getting back to the signal source.
要做到这一点，设计者必须掌握电流的实际流向和返回信号源的路径。
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