教学目的要求:①指导学生认识电磁铁的构造、性质和用途。②培养学生的实验能力。 教学重点:电磁铁的性质。教学难点;电磁铁的磁极、磁力可变与什么因素有关。 教具准备:电池、大铁钉、漆包线、指南针、大头针等。(够10个实验小组用) 教学过程: (一)复习提问:磁铁有哪些性质? Teaching Objectives Requirements: ① guide students to understand the structure of electromagnets, nature and purpose. ② training students experimental ability. Teaching focus: the nature of the electromagnet. Teaching difficult; electromagnet pole, magnetic variable and what factors. Teaching aids to prepare: batteries, nails, enameled wire, compass, pins and so on. (Enough for 10 experimental groups) Teaching process: (a) review questions: What are the properties of the magnet?