Motors have electrical energy supplied to their windings and a magnetic field that develops an electromagnetic interaction to produce mechanical energy or torque.

电能供给电动机绕组和磁场，产生电磁感应作用，试电动机产生机械能或者转矩。

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This is an introductory subject in the field of electric power systems and electrical to mechanical energy conversion.

本课程简介有关于电力系统及电机机械之能量转换这两个领域。

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However, the average electrical field strength and energy consumption for the maximum enhancement factor for the triangular rod electrode are much lower than for the cylindrical electrode.

在达到最大强化因数时，三角形电极所需要施加的平均电场强度和能耗比圆柱电极低得多。

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Travel up the Columbia River, which has long supplied this area with cheap electrical power, and you can see and hear what's luring students into the energy field.

NPR: Young Workers Find Opportunity In Power Industry