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.
Author(s): NJATC
Edition: 3
Publisher: Delmar Cengage Learning
Year: 2009
Language: English
Pages: 256
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
