当线圈（导体回路）不动而磁场变化时，穿过回路的磁通量也发生变化，由此在回路中激发的感应电动势叫做感生电动势。 在电路学里，电动势（英语：electromotive force，缩写为emf）表征一些电路元件供应电能的特性。这些电路元件称为“电动势源”。电化电池、太阳能电池、燃料电池、热电装置、发电机等等，都是电动势源。
在电动机里电流是由外电源供给的感生电动势的方向和电枢电流i方向相反。
Years in the motor current is outside the power supply from the induced electromotive force and the direction of armature current I in opposite directions.
该结论不但适用于闭合回路中的感生电动势的计算，而且也适用于有限长导体上的感生电动势的计算。
The conclusion not only can be applied in the calculation of electromotive force of close loop, but also can be applied in the calculation of electromotive force of limited conductor.
通过采用双引线电极和垂直引线技术，使引线回路中的附加感生电动势降低为未采用前的10%，提高了系统的总体精度。
By use of the technique of twisted pair wire, the additive EMF in the circuit of the electrode leads has been reduced to 10% of that before use and the precision of the system has been improved.
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