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Revista Brasileira de Ensino de Física

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

Abstract

LARA, Vitor  and  DECHOUM, Kaled. Kirchhoff’s voltage law corrected for radiating circuits. Rev. Bras. Ensino Fís. [online]. 2015, vol.37, n.1, 1307.  Epub Mar 30, 2015. ISSN 1806-1117.  http://dx.doi.org/10.1590/S1806-11173711651.

When a circular loop composed by a RLC circuit begins to oscillate, the oscillation will eventually vanish as an exponentially decaying current, even considering superconducting wires, due to the emission of electric and magnetic dipole radiations. In this work we propose a modification of the Kirchhoff’s voltage law by adding the radiative contributions to the energy loss as effective resistances, whose values are relatively small when compared to typical resistance values, but are fundamental to describe real circuits correctly. We also analyse the change in the pattern of the radiation spectra emitted by the circuit as we vary the effective and electric resistances.

Keywords : oscillating circuits; Kirchhoff’s voltage law.

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