DC Theory

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