The problem of choice of zero point of electric potential is analyzed. concentrating on how to choose and the limited conditions.

对电势零点的选取问题进行了分析，重点论述了电势零点如何选取及所限定的条件。

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There is voltage to ground between ground part of electric equipment and point of zero electric potential of earth.

电气设备的接地部分与大地零电位点之间存在对地电压。

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Eventually, it debates how to superpose the electric potential when the zero point is different.

最后讨论零点不同的电势如何进行叠加。

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