当电流通过电阻时，电流做功而消耗电能，产生了热量，这种现象叫做电流的热效应。实践证明，电流通过导体所产生的热量和电流的平方，导体本身的电阻值以及电流通过的时间成正比。这是英国科学家焦耳和俄国科学家楞次得出的结论，被人称作焦耳－楞次定律。
电流通过液芯光纤，电流的热效应降低了液体样品荧光光谱强度。
The fluorescence spectrum intensity is reduced by the heat effect of electric current when the current flows through a liquid-core optical fiber.
电流三种最重要的效应是热效应、磁效应和化学效应。
The three most important effects of an electric current are heating, magnetic and chemical effects.
为了对比一个已知直流参考的未知交流信号热效应，计量人员可以确定在一段时间内直流的交流有效值(电压或电流)。
By comparing the heating effect of an unknown AC signal to that from a known DC reference, metrologists can determine the RMS AC quantity (voltage or current) in terms of the DC quantity.
应用推荐