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Revista Brasileira de Ensino de Física

Print version ISSN 1806-1117On-line version ISSN 1806-9126

Abstract

CRUZ, Vagner Santos da  and  SOARES, Vitorvani. Experimental determination of the Boltzmann constant from current-voltage characteristic of a diode. Rev. Bras. Ensino Fís. [online]. 2015, vol.37, n.1, 1311.  Epub Mar 30, 2015. ISSN 1806-1117.  http://dx.doi.org/10.1590/S1806-11173711678.

We present in this work a didactic experimental activity with a diode, set up with affordable instruments, and that can be easily adapted for an undergraduate or a high school class. The activity described establishes the current ID-voltage VD characteristics of a diode from measurements of the potential difference VD on it and the current ID through it, for three different temperatures T = 0 °C, 23 °C, and 100 °C. From the experimental results: (i) we build up an algebraic expression for the current ID as a function of the voltage VD, and the temperature T, and (ii) we determine the value of the Boltzmann’s constant kB, one of the physical fundamental constants.

Keywords : diode; current-voltage characteristic curve; Boltzmann constant.

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