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yan jiu dian re gen na xie yin su you guan de shi yan gai jin
Author(s): 
Pages: 33
Year: Issue:  4
Journal: Experiment and Equipment for Primary School

Abstract: 1 教学背景 浙教版科学9年级上册P108有个研究电热跟哪些因素有关的实验,按课本中的实验装置(见图1)进行实验,会出现以下几个不利于课堂效率和教学效果的衍生问题:①由于煤油用量多,整个实验时间长达20多分钟,影响教学任务的完成;②液柱上升的实验现象难让全体学生看清;③煤油加热后易从瓶塞处泄漏污染其他仪器和桌面;④装置分散安装,稳定性差,操作不便;⑤教学任务完成后需回收煤油,装置不能长久保存,下一个学年教师做此实验时,仪器需要重新装配;⑥此装置只能做定性实验,难以研究电热跟电阻大小、通电时间、电流大小之间的定量关系.
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