電（子）之所以流動，是因為乾電池上正負兩端上的電的狀況有差別所致，對於這種差別，我們稱之為「電位差」。
The difference in the electrical condition of the terminals "+" and "-" of the dry cell which tends to make electricity flow we describe as a difference of electrical potential.
給操作部件或電子器件供電的一種電力分配匯流排（或電纜線）。
An electric power distribution bus(or cable) that supplies functional units or electronic devices.
水力發電的通過轉變奔騰的水的能量產生電
Generating electricity by conversion of the energy of running water.
你們的集中供熱設備是煤氣的還是用電的？
Is your central heating gas or electricity?
