Contents Preface xix Part 1 Direct current 1 Basic physical concepts 3 Atoms 3 Protons, neutrons, and the atomic number 4 Isotopes and atomic weights 4 Electrons 5 Ions 5 Compounds 9 Molecules 10 Conductors 11 Insulators 11 Resistors 13 Semiconductors 14 Current 15 Static electricity 15 Electromotive force 16 Nonelectrical energy 18 Quiz 19 2 Electrical units 23 The volt 23 Current flow 24 The ampere 26 Resistance and the ohm 26 Conductance and the siemens
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