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Direct Current Fundamentals

ISBN: 9780766809598 | 0766809595
Edition: 6th
Format: Paperback
Publisher: Cengage Learning
Pub. Date: 11/16/1999

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SummaryTable of Contents
Direct Current Fundamentals, 6E is by far the best and most reliable selection for comprehensive DC theories and applications. This comprehensive book on DC information includes many examples of basic DC circuits and equipment providing users with the fundamental concepts of DC electricity and magnetism, in preparation for further studies in electricity and electronics.
Preface
An Introduction to Electricity and Electronics
1(11)
What are electricity and electronics?
Why this book is called... MORE
Early history of electricity
One hundred elements---building blocks of nature
The atom analyzed---electrons, protons, and neutrons
The atomic theory---cornerstone of electrical theory
Electricity Production and Use
12(9)
Electricity production by energy conversion
Electricity from friction
Electricity from magnetism
Electricity from chemical energy
Electricity from light
Electricity from heat
Electricity from mechanical pressure: piezoelectricity
The effects of electricity
Electrostatics
21(15)
Stationary electrons
Electroscopes
Electrostatic induction
Lightning
Nuisance static charges
Useful static charges
Potential energy of electrons
Electric lines of force
Basic Circuit Concepts
36(13)
Three measurable circuit quantities
Voltage
Current
Resistance
A simple electric circuit
Open circuits and closed circuits
The schematic diagram
Basic circuit notation
The short circuit
Electrical safety
National Electrical Code®
Scientific Notation and Metric Prefixes
49(14)
Rationale for studying this unit
Powers of 10
Scientific notation
Significant digits
Rounding off to three significant digits
Metric prefixes
Multiplication and division with powers of 10
Electrical Quantity Measurement
63(17)
Types of meters
Ammeter and voltmeter scale interpretation
Ohmmeter scale interpretation
Electrical meter connection
Resistance
80(19)
Conductance vs. resistance
Resistivity of materials
Length of a conductor
Cross-sectional area (CSA) of a conductor in circular mils
Effect of temperature on resistance
The American Wire Gauge (AWG)
Stranded wire and cable
Commercial resistors
Ohm's Law
99(5)
Voltage, current, and resistance
Ohm's law with metric prefixes
Electrical Power and Energy
104(18)
Energy
Units of energy
Power
Energy and cost calculations
Efficiency of energy conversion
A practical application---resistance heating
Series Circuits
122(28)
Characteristics of series circuits
The voltage drop
Resistance and current in series circuits
Power consumption in series circuits
Calculation of series circuit quantities
Voltage drop on a line
Voltage at an open element
Series circuits as voltage dividers
Polarity considerations
Ground as a reference point
Voltage sources in series
Parallel Circuits
150(19)
The nature of parallel circuits
Five methods of computation
Use of Ohm's Law for computing RT
Use of the reciprocal equation
A practical method
The product over the sum formula
A special condition: all equal resistors
Power dissipation in parallel circuits
Voltage sources in parallel
A practical application---kitchen range heating element
Series-Parallel Circuits and Loaded Voltage Dividers
169(23)
Simplifying series-parallel circuits
Kirchhoff's voltage law
Kirchhoff's current law
Loaded voltage dividers
Conduction in Liquid and Gases
192(16)
The ionization process
Useful chemical compounds
Electroplating and electrolysis
Gases as insulators
Gaseous conduction by ionization
Conduction and ions in nature
Conduction in a vacuum
Batteries
208(26)
Chemical energy: a source of emf
Anodes and cathodes
Primary cells
Fuel cells
Secondary cells
Maintenance-free batteries
Miscellaneous aspects of batteries
Magnetism and Electromagnetism
234(22)
Electricity and magnetism
Simple magnets
The magnetic field
Ferromagnetic materials and the magnetizing process
Magnetic materials and the atomic theory
Permanent magnets
Electromagnetism of a straight wire
Electromagnetism of a coil
The magnetic core in the coil
Magnetic quantities
Applications of Electromagnetism
256(12)
Solenoids for lateral motion
The electromagnetic relay
Magnetic vibrators and bell
Electromagnetism for rotational motion
Other applications of the motor effect
Electromagnetism at work
Electrical Measuring Instruments (Another Application of Electromagnetism)
268(21)
d'Arsonval meters
DC ammeters
Multirange ammeters
Voltmeters
Ohmmeters
Megohmmeters
Wattmeters
Wheatstone bridges
Clamp-on meters
Electromagnetic Induction
289(13)
Moving coils---stationary fields
Moving fields---stationary coils
Left-hand rule for generators
Lenz's law
Induction in rotating machines
DC Generators
302(36)
Principles of DC generators
Armature design
Generator field structures
Armature reaction
Buildup of self-excited fields
Three types of self-excited generators (series, shunt, and compound)
Separately excited generators
Generator calculations
Power losses
Generator data and ratings
Magnetohydrodynamic (MHD) generation
Mechanical Motion From Electrical Energy
338(14)
Basic motor action
Torque and rotary motion
The need for commutation
The need for added armature coils
From torque to horsepower
DC Motors
352(30)
DC machines: motor or generator?
The counter-emf in a motor
Armature windings
Field distortion and the need for interpoles
The shunt motor
The series motor
The compound motor
Speed control of DC motors
Reversal of rotation
Power losses
Permanent magnet motors
Starters and Speed Controllers
382(35)
Trends in motor control
The need for reduced-voltage starting
Manual starters
Manual speed controllers
Starters for series motors
Drum controllers
Magnetic controllers
The counter-electromotive force motor controller
The voltage drop acceleration controller (lockout acceleration)
Definite time controller
Electronic controllers
Solving DC Networks
417(18)
The loop current method
The superposition theorem
Thevenin's theorem
Appendix435(20)
Glossary455(8)
Selected Answers to Odd-Numbered Problems463(8)
Index471

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