This edition of Study Briefs for Basic Electronics and Circuitry is useful for a beginner's introduction or an experienced user's quick refresher. It explains basic electronic components and symbols, circuit theories, and other modern electronics fundamentals. A description of must-have tools, meters, and testing instruments is included. Sample projects that a beginner or hobbyist might enjoy trying are a bonus feature. A listing of helpful online resources for further investigation and study are provided. Some of the topics covered are: Ohm's Law, power formula, voltage source, current flow, electromagnetism, and electronic components: resistors, capacitors, inductors, diodes, transistors, amplifiers, transformers, and integrated circuits. The section on Circuit Basics reviews Kirchoff's Circuit Laws, Direct Current (DC) and Alternating Current (AC). The differences between Series DC, Parallel DC, and Series-Parallel circuitry are discussed, including equations needed to compute total resistance. An overview of modern electronics highlights work with modular electronics such as processors, computers, and other input/output (I/O) devices with sample block diagrams and schematics. This Study Brief is perfect for an occasional reference or the kick start you need to further your interest in Basic Electronics or Circuitry.