5.1 - Introduction5.2 - Classical Free Electron Theory of Metals5.3 - Relaxation Time, Mean Free Path, Mean Collision Time and Drift Velocity5.4 - Fermi-Dirac Distribution5.5 - Quantum Free Electron Theory of Electrical Conduction5.6 - Sources of Electrical Resistance5.7 - Band Theory of Solids5.8 - Bloch Theorem5.9 - Origin of Energy Bands Formation in Solids5.10 - Velocity and Effective Mass of an Electron5.11 - Distinction Between Metals, Semiconductors and InsulatorsFormulaeSolved ProblemsMultiple Choice QuestionsAnswersReview Questions