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湘科版小学《科学》五年级下册“电磁铁磁力”和人教版九年级《物理》第二十章“电与磁”实验原型存在不足,直接影响了实验效果,甚至会挫伤学生的实验积极性。依据杠杆知识和磁铁的基本性质,根据弹簧测力计、电流、电压表的工作情况,可以用转换法将电磁铁磁力的大小通过显示盘的指针显示出来。当电磁铁磁力大时,指针偏转角度大,当电磁铁磁力小时,指针偏转角度小。另外,可以通过改变电池节数来控制电流大小、线圈匝数的多少、铁芯的有无、铁芯的长短、粗细等来观察电磁铁磁力大小情况。该教具运用于教学,增强了课堂教学效果,锻炼了师生的动手技能和创新能力,提高了师生的科学素养。
Electromagnetic magnetism “and” Pluto magnetism “of the” Science “fifth grade primary school of the Xiangke science edition primary school and the tenth chapter of the” Physics “of the PEP. The deficiencies of the experimental prototype of” electricity and magnetism "directly affect the experimental effect and even Will dampen students’ experimental enthusiasm. Based on the knowledge of the lever and the basic properties of the magnet, according to the work of the spring force gauge, current and voltmeter, the size of the magnetic force of the electromagnet can be displayed through the pointer of the display plate by the conversion method. When the electromagnet magnetic force is large, the pointer deflection angle, when the magnet magnetic force is small, the pointer deflection angle is small. In addition, you can change the number of battery cells to control the current size, the number of turns of the coil, the core of the iron core length, thickness and so on to observe the size of the magnet magnetic force. The teaching aids used in teaching, enhance the effectiveness of classroom teaching, teachers and students exercise the skills and innovative ability to improve the scientific quality of teachers and students.