1 Introduction 1 l.l The Electrical/Electronics Industry l l.2 A Brief History 2 l.3 Units of Measurement 7 l.4 Systems of Units 8 l.5 Significant Figures, Accuracy, and Rounding Off 11 l.6 Powers of Ten l2 l.7 Conversion between Levels of Powers of Ten l8 l.8 Conversion within and between Systems of Units l9 l.9 Symbols 21 l.10 Conversion Tables 22 l.l1 Calculators 22 l.l2 Computer Analysis 25 2 Current and Voltage 31 2.l Atoms and Their Structure 3l