一、三维教学目标1.理解导体和绝缘体的概念,即易导电的物质叫做导体,不易导电的物质叫做绝缘体。2.制订并完成小组计划,实施有关检测步骤。3.培养合作意识和实证精神。二、教学重点1.理解导体和绝缘体的概念。2.实验操作与过程。三、教学难点制订计划。四、教具准备电路检测器(前节课学生已自制),条形橡皮擦,20种被检测材料(以上材料每小组准备一套即可,20种被检测材料由教师准 First, the three-dimensional teaching objectives 1. To understand the concept of conductors and insulators, that is easily conductive material called conductor, not conductive material called insulation. 2. Develop and complete a group plan to implement the testing steps. 3. Cultivate the sense of cooperation and positivism. Second, the teaching focus 1 understand the concept of conductors and insulators. 2. Experimental operation and process. Third, difficult to make plans for teaching. Four, teaching aids to prepare the circuit detector (before class students have self-made), strip eraser, 20 kinds of tested materials (the above materials can be prepared for each group, 20 kinds of materials to be tested by teachers