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arXiv physics/0501093physics.ed-ph
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用理解诱导的EMF识别学生的学习困难

Identifying Student Difficulties with Understanding Induced EMF

Scott Secrest, Ingrid Novodvorsky

摘要:

本文报道了一项学生对感应电动势理解的研究。参加物理实验室课程的学生完成了前测和后测,其中包括有关感应电动势的问题。在后测之后,其中一些学生参加了访谈,在访谈中他们详细阐述了自己的想法。文章中提供了前测和后测数据,以及样本访谈文本。在实验室课程的指导后,大多数学生能够识别移动线圈附近的磁铁会感应电流。然而,近一半的人无法正确确定感应电流的方向。许多学生也表现出难以接受的想法,电动势是由变化的磁通量,而不仅仅是变化的磁场。

英文摘要:

This paper reports on a study of student understanding of induced EMF. Students enrolled in a physics lab course completed a pretest and posttest that included questions about induced EMF. Following the posttest, some of those students participated in interviews in which they elaborated on their ideas. Pretest and posttest data are presented in the article, as well as sample interview text. After instruction in the lab course, most students were able to identify that moving a magnet near a coil would induce a current. However, nearly half were unable to correctly determine the direction of the induced current. Many students also demonstrated difficulty with the idea that an EMF is induced by a changing magnetic flux, not just a changing magnetic field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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