Contribution: A didactic methodology, based on analytical expressions and experimental validation, to describe the process of abrupt current interruption in a series RL circuit, that considers real passive components and uses a toggle switch as disconnecting device. Background: In undergraduate courses, circuits adopted in transient analysis usually assume electrical switches in their ideal form, disregarding electrical impedance and its variation over time. Texts and instructors rarely point out these simplifications, so students can become confused. There is thus a need for a suitable switch model that yields a behavior consistent with real devices, while permitting a mathematical formulation of the inductor current. Intended Outcomes: That students should understand electrical component modeling, and how models can represent the physical phenomena that occur in electrical circuits. Application Design: An experiment, designed to evaluate students’ perceptions of switch modeling, modeled a switch by using three different equivalent circuits of increasing complexity, to allow a more realistic simulation. Electrical switch modeling is described, with the models being based on measurements performed on a real circuit. Findings: Student performance was evaluated qualitatively through test scores, and quantitatively through a post-class questionnaire. The results indicate that 96.15% of the students were able to propose an accurate model of the electrical switch.

中文翻译：

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低压电路中电感“反冲”的建模与分析

贡献：一种基于分析表达式和实验验证的教学方法，用于描述串联 RL 电路中的突然电流中断过程，该方法考虑真实的无源元件并使用拨动开关作为断开装置。背景：在本科课程中，瞬态分析中采用的电路通常假设电气开关处于理想形式，不考虑电阻抗及其随时间的变化。课文和教师很少指出这些简化，因此学生可能会感到困惑。因此，需要一种合适的开关模型，该模型产生与实际设备一致的行为，同时允许电感电流的数学公式。预期成果：学生应该了解电气元件建模，以及模型如何表示电路中发生的物理现象。应用设计：一个实验，旨在评估学生对开关建模的看法，通过使用三个不同的、越来越复杂的等效电路对开关进行建模，以实现更真实的仿真。描述了电气开关建模，模型基于在实际电路上执行的测量。结果：学生的表现通过考试成绩进行定性评估，并通过课后问卷进行定量评估。结果表明，96.15% 的学生能够提出电气开关的准确模型。通过使用三个不同的、越来越复杂的等效电路对开关进行建模，以实现更真实的仿真。描述了电气开关建模，模型基于在实际电路上执行的测量。结果：学生的表现通过考试成绩进行定性评估，并通过课后问卷进行定量评估。结果表明，96.15% 的学生能够提出电气开关的准确模型。通过使用三个不同的、越来越复杂的等效电路对开关进行建模，以实现更真实的仿真。描述了电气开关建模，模型基于在实际电路上执行的测量。结果：学生的表现通过考试成绩进行定性评估，并通过课后问卷进行定量评估。结果表明，96.15% 的学生能够提出电气开关的准确模型。