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“电源电动势”是高二物理《恒定电流》一章中的重要概念,深入的理解电源电动势的含义,才能正确的理解和应用闭合电路欧姆定律.高中阶段,电源电动势的定义方式有两种.一种是比值性定义:电动势在数值上等于非静电力把1C的正电荷在电源内从负极移送到正极所做的功;另一种是测量性定义:电源的电动势等于电源没有接入电路时两极间的电压.笔者在实际教学中发现,很多学生对电源电动势定义以及与之相关的概念掌握的模糊不清,从而陷入了理解的误区,导
“Power electromotive force ” is an important concept in the physics “constant current” of sophomore year, in-depth understanding of the meaning of the power electromotive force in order to correctly understand and apply the Ohm’s law of closed circuit.In high school, the power electromotive force is defined in two ways One is the definition of the ratio: the electromotive force is equal to the non-electrostatic power in the positive charge of 1C in the power transfer from the negative to the positive pole work done; the other is the measurement of the definition: the electromotive force equal to the power supply is not connected Circuit voltage between the two poles in the actual teaching I found that many students on the definition of power electromotive force and related concepts obscure, and thus fell into the misunderstanding of the guide