初中第七章第8节“电池”和高中化学“原电池”等内容,都要做伏打电池实验。但由于伏打电池输出电压低(一般只有0.8伏),产生的电流比较微弱,小电珠作负荷,耗电量大,发光时间仅约2～4秒钟左右。因此可见度差,看不清楚。我在教学中反复实践,对伏打电池作些改进,使小电珠发光时间提高到15分钟左右,且亮度正常,其做法如下: 1、取50×150毫米的铜片和锌片各1块。锌片可从旧的干电池截取,铜片要在酒精灯上反复灼烧麦面生成一层黑色的氧化铜 The voltaic battery experiment is required for the contents of the eighth chapter of the junior high school “Battery” and the high school chemistry “primary battery”. However, due to the low volt battery output voltage (usually only 0.8 volts), the generated current is relatively weak, small beads for load, power consumption, light time is only about 2 to 4 seconds. Therefore, visibility is poor and it is not clear. I practiced repeatedly in teaching, and made some improvements to the voltaic cells. The light-emitting time of small beads was raised to about 15 minutes, and the brightness was normal. The practice was as follows: 1. Take 50×150 mm copper pieces and zinc pieces one each. . The zinc plate can be taken from the old dry cell, and the copper plate will repeatedly burn the wheat flour on the alcohol lamp to form a layer of black copper oxide.