the force of an electric current produced by any device that supplies electrical energy

The volt is the SI derived unit of electromotive force, commonly called "voltage". 伏特是电动势的国际单位制导出单位，通常称为“电压”。

He invented an improved thermopile for measuring small electromotive forces. 他发明了一种改进的热电堆来测量微小的电动势。