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Titre : | An Inquiry Approach to Effective Use of Instrumentation: An Example from RC Circuits (2022) |
Auteurs : | G. Harvey ; M. Gilday ; T. J. Kelly |
Type de document : | Article |
Dans : | The Physics Teacher (03/60, Mars 2022) |
Article en page(s) : | p. 192-194 |
Note générale : | https://doi.org/10.1119/10.0009687 |
Langues: | Anglais |
Descripteurs : |
HE Vinci Electronique ; Expérience scientifique ; Instrument de mesure ; Modélisation |
Résumé : | In this article, we present an intriguing experimental exercise that does not fall foul of improper use of instrumentation. The activity is designed as an electronics exercise where the role of the instruments in the measurement of the RC time constant is considered. Essentially, we study the accuracy and precision of a measurement of the RC time constant in a series circuit with an oscilloscope as a function of the value of the resistor, against the predicted linear model of τ = RC. As the value of the resistor approaches the value of the impedance of the oscilloscope, the time constant deviates from the linear model. We show how to adapt the model to account for this and create a mathematical model that agrees with the measurements. It is hoped that such an exercise will solidify a rule of effective use of oscilloscopesthat the resistance of the circuit should be much lower than the impedance of the scopein the mind of the student. |
Disponible en ligne : | Non |
Exemplaires (1)
Cote | Support | Localisation | Section | Disponibilité |
---|---|---|---|---|
The Physics Teacher. 03/60 (Mars 2022) | Périodique papier | Louvain-la-Neuve | Etagère des revues | Prêt autorisé Disponible |