2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/102390A simple methodical derivation for Landauer quantization of the conductivity is derived as a simple consequence of the Bohr quantization laws. The level of explanation corresponds to high-school level of Physics education and can be used as popular lecture for students. The purpose of the work is to introduce students in an achievement of nano-technology which is relevant to the future electronics. Using only the fundamental laws of quantization students can understand a contemporary experimental research and to follow future development in the field.10 pages, 5 figures, PACS: 01.40.Fk, 73.63.Nm, 73.63.Rt; Slovak version is also included, Technical improvements in version 2Physics EducationPopular Physicstext