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在“恒定电流”一章里常见到一些有关“功率”的问题,由于“功率”的种类繁多,学生很难准确掌握和正确应用。教学实践证明,把本章涉及到的功率加以归纳、分类、比较,大有好处。1 有关电源的几种功率1.1 电源的功率电动势是电源内非静电力把单位正电荷从负极移到正极所做的功,即E=W/q,这样电源的功率
In the “Constant Current” chapter, some problems related to “Power” are commonly seen. Due to the wide variety of “power”, it is difficult for students to accurately grasp and correctly apply. Teaching practice proves that it is of great benefit to summarize, classify, and compare the power involved in this chapter. 1 Several kinds of power related to the power supply 1.1 The power EMF of the power supply is the work done by the non-electrostatic force inside the power supply to move the unit positive charge from the negative electrode to the positive electrode, that is E=W/q, so that the power of the power supply