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原高中课本《物理》下册(人民教育出版社,1987年4月第2版,第138页)第四章练习三第2题:“图4—22是法拉第做成的世界上第一个发电机模型,在磁铁两极间放一铜盘,转动铜盘,就可以获得持续的电流。试解释其作用原理。”教学参考书(高中物理下册,人民教育出版社,1987年7月第2版,第260页)是这样解释的:“如图4—37所示,我们把铜盘看成由无数条辐条所组成。当铜盘转动时,位于磁场中的辐条做切割磁力线运动产生感生电动势,电路闭合就产生感生电流。铜盘连续转
The original high school textbook “Physics” second volume (People’s Education Press, April 1987, second edition, p. 138) Chapter 4 practice three Question 2: “Figure 4-22 is Faraday made the world’s first In the generator model, a copper disk is placed between the two poles of the magnet, and a continuous current is obtained by rotating the copper disk. Explain the principle of the operation.” Reference for Teaching (High School Physics Book, People’s Education Press, July 1987 The second edition, p. 260 explains this: "As shown in Figure 4-37, we see the copper disk as an infinite number of spokes. When the copper disk rotates, the spokes in the magnetic field do the cutting motion of the magnetic field. Induced electromotive force, induced electric current when the circuit is closed.