电路连接和电路识别是初中物理教学中的一个难点 .教师常常通过演示和让学生自己动手连接来熟悉电路 .但由于演示实验的可视性差 ,而学生自己动手操作又受实验条件限制不能反复练习 ,因而影响了教学效果 .还有 ,在电路识别练习中 ,经常需要移动元件位置 ,反复画电路图 ,影响教 Circuit connection and circuit recognition is a difficult point in junior middle school physics teaching. Teachers often familiarize themselves with circuits by demonstrating and letting students connect by themselves. However, due to the poor visibility of demonstration experiments, students can’t practice repeatedly due to their own hands-on operation and limited by experimental conditions. As a result, the effect of teaching is affected. Also, in circuit recognition exercises, it is often necessary to move the position of components and repeatedly draw circuit diagrams to influence teaching.