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能量可以相互转化。只要是有别的形式的能量，通过一定的手段和设备，就是可以将其转化为电能。比如说热能，机械能，磁能，核能都可以转化为电能。
物质都是由分子组成，分子是由原子组成，原子中有带负电的电子和带正电荷的质子组成。在正常状况下，一个原子的质子数与电子数量相同，正负平衡，所以对外表现出不带电的现象。但是电子环绕于原子核周围，一经外力即脱离轨道，离开原来的原子儿而侵入其他的原子B，A原子因缺少电子数而带有正电现象，称为阳离子、B原子因增加电子数而呈带负电现象，称为阴离子。
造成不平衡电子分布的原因即是电子受外力而脱离轨道，这个外力包含各种能量(如动能、位能、热能、化学能……等)在日常生活中，任何两个不同材质的物体接触后再分离，即可产生静电。
当两个不同的物体相互接触时就会使得一个物体失去一些电荷如电子转移到另一个物体使其带正电，而另一个体得到一些剩余电子的物体而带负电。若在分离的过程中电荷难以中和，电荷就会积累使物体带上静电。所以物体与其它物体接触后分离就会带上静电。通常在从一个物体上剥离一张塑料薄膜时就是一种典型的“接触分离”起电，在日常生活中脱衣服产生的静电也是“接触分离”起电。
固体、液体甚至气体都会因接触分离而带上静电。这是因为气体也是由分子、原子组成，当空气流动时分子、原子也会发生“接触分离”而起电。
我们都知道摩擦起电而很少听说接触起电。实质上摩擦起电是一种接触又分离的造成正负电荷不平衡的过程。摩擦是一个不断接触与分离的过程。因此摩擦起电实质上是接触分离起电。在日常生活，各类物体都可能由于移动或摩擦而产生静电。另一种常见的起电是感应起电。当带电物体接近不带电物体时会在不带电的导体的两端分别感应出负电和正电。其它起电方式有：热电和压电起电、亥姆霍兹层、喷射起电等。
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