Purdue University researchers are working with General Motors to build thermoelectric generators, which produce an electric current when there is a temperature difference.
珀杜大学的研究者们正在与通用汽车一道开发一种利用温差产生电流的热能发电机。
Sensitive Galvanometer, Model J0409, is suitable for the laboratories of middle schools and polytechnic schools to measure small electric current and electric potential difference.
J0409型灵敏电流计适用于中学、中专等实验室测量直流电路中微小电流和微小电势差。
The electric current does not flow if there is not potential difference between the ends of a conductor.
如果导体两端没有电位差，电流就不会流动。
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