On the problem of (dis)charging a capacitor through a lamp

Ross, Robert T.; Venugopal, Prasad

doi:10.1119/1.2178844

Cited by 11 publications

(7 citation statements)

References 3 publications

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“…As demais se referem ao ensino desses circuitos, mas não focam a atenção na aprendizagem dos alunos. Mais recentemente constam algumas novas possibilidades de abordagens teóricas e experimentais para o ensino [17][18][19][20].…”

Section: Revisão Da Literaturaunclassified

Simulação e modelagem computacionais no auxílio à aprendizagem significativa de conceitos básicos de eletricidade. Parte II: circuitos RLC

Dorneles

Araújo

Veit

2008

Rev. Bras. Ensino Fís.

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Neste artigo analisamos o comportamento da energia eletromagnética em circuitos do tipo RLC. Discutimos as principais dificuldades dos alunos na aprendizagem de conceitos básicos envolvidos neste tipo de circuito e apresentamos dois produtos oriundos de um trabalho de pesquisa: i) um conjunto de atividades de simulação e modelagem computacionais, propostas com o software Modellus, levando em conta tais dificuldades, com o objetivo de auxiliar o aluno a superá-las e ii) um teste sobre a compreensão de conceitos físicos envolvidos em circuitos RLC.

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Section: Revisão Da Literaturaunclassified

Simulação e modelagem computacionais no auxílio à aprendizagem significativa de conceitos básicos de eletricidade. Parte II: circuitos RLC

Dorneles

Araújo

Veit

2008

Rev. Bras. Ensino Fís.

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“…As shown in figure 1, this process is slow enough to be observed in qualitative experiments or demonstrations, which are ideal for enquirybased methods. In a recent publication the problem of (dis)charging a capacitor through a bulb was quantitatively analysed, taking into account the resistance variation of the filament due to the temperature change [9]. From a qualitative point of view, the bulb can be considered as a quasi-resistor, and the transient behaviour of the supercapacitor-bulb circuit is similar to an RC circuit, as shown in figure 1.…”

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confidence: 99%

The internal resistance of supercapacitors

2012

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In this paper we study the transient behaviour of RC circuits with supercapacitors, varying R between 1 and 100 . We demonstrate that supercapacitors behave as ideal capacitors in series with an internal resistance (r ∼ 8 for C = 0.2 F, 5.5 V). This result is important to optimize the demonstration of RC circuits using a supercapacitor in series with a light bulb, because the r value is comparable with the effective resistance of the bulb. This means that the bulb brightness is significantly decreased by r .

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“…The resulting solution for i(t) is found to accurately reproduce the experimental data. 4 Additionally, one can study the temperature dependence of the resistance of the lamp using data obtained from the same experiment. This is easily accomplished by placing the lamp in series with a charging capacitor.…”

Section: Theorymentioning

confidence: 99%

“…In a previous paper, we presented a numerical model that accurately described the time-varying characteristics of the current through the capacitor. 4 The model was implemented in the introductory laboratory.…”

Section: Introductionmentioning

confidence: 99%

An Innovative Inquiry Based Experiment On The Temperature Dependence Of The Resistance Of A Filament Lamp

Ross¹,

Venugopal²

2006 Annual Conference &Amp; Exposition Proceedings

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We have developed an innovative inquiry-based student laboratory activity dealing with the temperature dependence of the resistance of a filament lamp. This introductory experiment is appropriate for a second semester general physics laboratory. The hands-on, active learning laboratory experiment utilizes simple, inexpensive equipment to facilitate student learning of various direct current circuit concepts. The activity builds upon the results of previously published physics education research. Students perform a transient measurement of the current-voltage characteristic of a lamp in series with a charging (or discharging) capacitor. From the data students calculate the resistance and power dissipated in the lamp. Under normal operating conditions, i.e. the filament glowing brightly, the resistance-temperature characteristic of the filament is seen to exhibit power-law behavior.

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On the problem of (dis)charging a capacitor through a lamp

Cited by 11 publications

References 3 publications

Simulação e modelagem computacionais no auxílio à aprendizagem significativa de conceitos básicos de eletricidade. Parte II: circuitos RLC

Simulação e modelagem computacionais no auxílio à aprendizagem significativa de conceitos básicos de eletricidade. Parte II: circuitos RLC

The internal resistance of supercapacitors

An Innovative Inquiry Based Experiment On The Temperature Dependence Of The Resistance Of A Filament Lamp

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