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电源都有两个电极,电势高的叫做正极,电势低的叫做负极,非静电力由负极指向正极.图1是电源的一般原理图.当电源的两电极被导体从外面连通后,在静电力的推动下形成由正极到负极的电流.在电源内部,非静电力的作用使电流从内部由负极回到正极,使电荷的流动形成闭合的循环.
The power supply has two electrodes, the high potential is called the positive electrode, the low potential is called the negative electrode, and the non-static electricity is directed from the negative electrode to the positive electrode. Figure 1 shows the general principle of the power supply. When the two electrodes of the power supply are connected by the conductor, Under the impetus of electricity, a current flows from the positive pole to the negative pole, and inside the power supply, the non-electrostatic force causes the current to flow from the negative pole to the positive pole internally to form a closed cycle.