Current | Introduction to electrical engineering | Electrical engineering | Khan Academy

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电流的概念始于电荷的理解，包括正负电荷的相互作用。正电荷和负电荷相互吸引，而同种电荷则相互排斥。铜是良好的导体，因其外层电子易于参与电流的导电。通过施加电压，铜中的电子会移动，形成电流。电流的测量方法是计算单位时间内通过某一界面的电荷量。盐水中加入电池后，正负离子也会产生电流，测量方法与铜相同，电流仍然是电荷每秒的量。
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