Electronics Electronics is the branch of science that deals with the study of flow and control of electrons (electricity) and the study of their behavior and effects in vacuums, gases, and semiconductors, and with devices using such electrons.Download all notes in our App ALL TOPICS 1....Wave 2....Sound wave 3....Electromagnetic Spectrum 4....Electromagnetism 5....Radioactivity 6....Thermionic Emission 7...Electronics 8....Elementary Astronomy 9....Geophysics