传统的原电池大多采用锌片、铜片作为电极，但铜片上产生气体的现象不明显；传统的原电池实验用电流计的偏转来检测电流并判断原电池的正、负极，电流计表面太小，指针太细，不便于学生观察；判断正、负极需要推理，不直观，而且电流计价格较高。为了增强原电池实验的直观... Most of the traditional primary batteries use zinc sheets and copper sheets as the electrodes, but the phenomenon of gas generation on the copper sheets is not obvious. The traditional galvanic experiment uses the deflection of the ammeter to detect the current and judge the positive and negative electrodes of the primary battery, and the galvanometer surface is too large. Small, the pointer is too small, not easy for students to observe; to determine the positive and negative need reasoning, not intuitive, and the galvanometer has a higher price. To enhance the intuitiveness of the galvanic experiment...