Technical data The self-induction during the switch-off process with Cobra SMARTsenseArticle no: P1377169 ![]()
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Principle Having recognized that a self-induction voltage is generated in a coil when a DC circuit is closed, which counteracts the applied voltage, the students are now asked to recognize that the self-induction voltage has the same direction as the original, applied voltage when it is switched off. The first experiment could take on the character of a confirmation experiment if the students can predict its outcome based on their knowledge of the law of induction and Lenz's law. In addition, the second experiment should demonstrate that the self-induction voltage can take on values many times greater than the original voltage. Benefits
Tasks What effect does a coil have when it is switched off? Investigate the direction of the self-induction voltage that occurs in a coil when a DC circuit is opened. Learning Objectives With the experiment provided, the students should recognize that a self-induction voltage is produced when the circuit is switched off, which counteracts the drop in current.
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