2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/173497Two problems from the Victorian Age, the subdivision of light and the determination of the leakage point in an undersea telegraphic cable are discussed and suggested as a concrete illustrations of the relationships between textbook physics and the real world. Ohm's law and simple algebra are the only tools we need to discuss them in the classroom.8 pages, latex filePopular PhysicsPhysics EducationHistory and Philosophy of Physicstext