DC Theory

Description

Discover the fundamental direct current (DC) principles and applications, as well as the theories that underlie those principles - all in an effort to build a strong foundation in electrical technology! Written with the student electrician in mind, DC Theory, 3E uses a reader-friendly approach and begins with the basics of electricity and DC circuits, including how properties of materials are categorized within conductors, semiconductors, and insulators. Coverage gradually progresses to tackle more complex topics, like DC parallel circuits, DC combination circuits, magnetism and generators. With an emphasis on safety throughout, this book provides a valuable combination of both information and safe practice, providing students with the skills and knowledge necessary for future success in the electrical field. Table of Contents 1 - Electrical Basics Introduction Electrical Terms Current The Ampere Direction of Current Flow and Meters Measurement of Current The Volt Measuring Voltage The Ohm Using an Ohmmeter Measuring Resistance in a Circuit Ohm's Law of Proportionality Prefix Multipliers Electrical Power Safety and Arcs Summary Review Questions 2 - Elemental Electricity Introduction Matter and Atoms Electrical Properties of Materials Molecules and Compounds Sources of Electrical Energy Voltage Polarity Conductor Resistance Summary Review Questions 3 - Circuit Theory and Switches Introduction Wire vs. Conductor Circuit Concepts Switches Conductor Size Variation of Resistance with Area Material Type Effects on Conductor Resistance Determining the Total Resistance of a Conductor Circular Mils and Square Mils Conductor Resistance, Voltage Drop, and Wattage Loss Incandescent Lamps Summary Review Questions 4 - Series Circuits Introduction Diagrams Component Diagrams Schematic Symbols Types of Resistors Fixed Resistors Variable Resistors The Series Circuit Calculating Resistance in a Series Circuit Determining Proportional Relations in a Series DC Circuit Proportional Voltage Drop Wattage Calculations in Series DC Circuits Kirchhoff's Laws Voltage Sources Summary Review Questions 5 - DC Parallel Circuits Introduction Parallel Circuits: Definition and Principles Theory of Current in Parallel Calculating Total Resistance in Parallel Circuits Voltage Supply Multiple Voltage Sources Power Calculation in Parallel Circuits Summary Review Questions 6 - DC Combination Circuits Introduction Current in Combination Circuits Circuit Simplification Using Equivalent Components Solving Complex Circuits Calculating Voltage Drops in Combination Circuits Voltage Across a Simple Combination Circuit Finding Component Values Solving Circuit Values with Partial Information Power in Combination Circuits Summary Review Questions 7 - DC Circuit Analysis Introduction Voltage Dividers Law of Proportionality for Voltage Current Dividers The Superposition Theorem Kirchhoff's Laws Thevenin's Theorem Norton's Theorem Limiting Circuits by Wattage Rating Summary Review Questions 8 - Magnetism Introduction The Nature of Magnetism Theory of Magnetism Magnetic Reactions Magnetic Units of Measure Magnetic Flux Magnetic Shielding Summary Review Questions 9 - Electromagnetism Introduction Electricity and Magnetism Magnetic Direction Field Strength Electromagnetic Waves Magnetic Poles of Electromagnets Inducing Voltage with Magnetic Fields Factors Affecting Voltage Production Summary Review Questions 10 - DC Generators and Motors Introduction Calculating the Level of Induced Voltage DC Generators Parts of a Generator DC Generator Connections Self-Excited Shunt-Connected Generator Self-Excited Series Generator Self-Excited Compound Generators DC Motor Theory DC Shunt Motor Series Motor Compound Motor Permanent Magnet Motor Summary Review Questions Glossary Index