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TM 11-661 Electrical Fundamentals: Direct Current

TM 11-661 Electrical Fundamentals: Direct Current 1951-06-22. CONTENTS CHAPTER 1. MAGNETISM. Invisible forces 1 1 Early history of magnetism 2 1 Magnetic compass 3 1 Magnetism and electricity 4 1 Experiment: attraction of iron filings to a bar magnet 5 1 Artificial magnets 6 3 Magnetic and nonmagnetic substances 7 3 Magnetic poles 8 4 Earth as a magnet 9 5 Molecular theory of magnetism 10 5 Attraction and repulsion of magnetic poles 11 5 Factors affecting magnetic force 12 7 Magnetic field 13 8 Lines of force 14 11 Characteristics of magnetic fields 15 13 Permeability 16 14 Handling and care of magnets 17 15 Theory of magnetization 18 15 Summary 19 16 Review questions 20 17 2. ELECTRIFICATION. Early history of electrification 21 18 Attraction and repulsion 22 18 Theory of electrification 23 20 Structure of matter 24 20 Structure of the atom 25 21 Electrons, protons, and neutrons 26 23 Forces associated with matter in the universe 27 25 Charging 28 26 Summary 29 27 Review questions 30 27 3. ELECTROSTATICS. Electric field and lines of force 31 29 Exploring an electric field 32 29 Electric lines of force 33 29 Lines of force associated with two charged bodies 34 30 Potential energy in

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