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
