电（子）之所以流动，是因为干电池上正负两端上的电的状况有差别所致，对于这种差别，我们称之为“电位差”。
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.
给操作部件或电子器件供电的一种电力分配总线（或电缆线）。
An electric power distribution bus(or cable) that supplies functional units or electronic devices.
水力发电的通过转变奔腾的水的能量产生电
Generating electricity by conversion of the energy of running water.
你们的集中供热设备是煤气的还是用电的？
Is your central heating gas or electricity?
