电势能有正负吗？
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电势能有正负是相对势能0点（这一点同意三楼）,势能0点可以任意取的。电势能的正负可以如此判断：将一正电荷放在势能0点，正电荷向那走，说明那的电势能为负。有，
两个异种电荷组成的系统的电势能为负，
Ep=(KQ1Q2)/R,
当Q1，Q2 为异种电荷时，Ep为负。
其实就是相对势能0点，势能更高还是更低的区别。
正电荷在负电势处电势能为负
负电荷在正电势处电势能为负反之为正
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