在电学中有许多现象,因为电子本身的不可见,而使得大家对电的理解,增加困难。其实电子的流动和水的流动有许多地方是十分相似的,所不同的只是水的流动可以直接观察而电子的流动是人眼所不能看出来的。在地理课中,我们知道在长江两旁有很多的湖泊;像洞庭湖和鄱阳湖,它们都和长江相通,有调节水流的作用,在春夏季水涨的时候,长江中过多的水便流入这些湖泊中存储起来,到秋冬水枯的时候,水又可以由这些湖泊流入长江。在电学中也有像这些 There are many phenomena in electricity because the electrons themselves are not visible, which makes it difficult for everyone to understand electricity. Actually, the flow of electrons and the flow of water are very similar in many places. The only difference is that the flow of water can be observed directly and the flow of electrons cannot be seen by the human eye. In the geography class, we know that there are many lakes on both sides of the Yangtze River; like Dongting Lake and Poyang Lake, they all communicate with the Yangtze River and regulate the flow of water. When the spring and summer waters rise, too much water in the Yangtze River flows into it. These lakes are stored so that water can flow from these lakes into the Yangtze River by the time the water falls in autumn and winter. There are also like these in electricity