描述
要使电路中有持续不断的电流，必须保持电路中有一定的电场存在，电源的作用就是产生和保持电路上一定的电场。电源之所以能起这一作用的关键在于电源内部的电荷除了受到静电力的作用外，还受到非静电力的作用。在不同种类的电源里，非静电力（也叫局外力）的性质和起因各不相同，例如在蓄电池里，这种非静电力就叫做化学力，起因于金属和酸溶液之间的化学反应。
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