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ELEMENTS OF ELECTRICAL ENGINEERING
Contents
1 Introduction
Concept of electrical energy
Importance of electrical energy
Sources of electrical energy
Applications of electrical energy
Advantages of electrical energy
Effects of electric current
Exercises
2 Technical terms and definitions with units
Introduction
Atomic structure
Energy of an electron
Nature of electricity
Electric charge
Definition of electric current with unit
Difference between the electron current flow and the conventional
Current flow
Definition of electromotive force
Effect of electric current and their applications
General symbols used in electrical circuit
Exercises
3 Study of electrical engineering materials
Introduction
Classification of electrical engineering materials
Classification of materials based on atomic structure
Classification of materials
Classification of conducing materials
Low resistivity materials
Low resistive copper alloys
Low resistive conductor materials
Liquid conductor
High resistivity materials
Fullerence
High resistivity alloys
Exercises
Insulating materials
Insulating resins
Liquid insulating materials
Gaseous insulating materials
Miscellaneous insulating materials
Exercises
Semiconductor materials
Exercises
Magnetic materials
Exercises
Refractory materials
Exercises
4 Resistance temperature effects
Resistance
Factors upon which resistance depends resistance law
Specific resistance and its unit
Effect of temperature on resistance
Temperature coefficient of resistance
Value of at different temperatures
Summary of temperature coefficient relations
Exercises
5 Electrical circuits and basic laws
Electrical circuit
Path of electric current
Types of electric circuits
Ohm’s law
Combinations of resistances
Kirchhoff’s laws
Exercises
6 Work, power and energy
Mechanical units
Relationship between mechanical units electrical units
Efficiency
Heating effect of the electric current
Joule’s law of electric heating
Exercises
7 Secondary cells and batteries
Electrolysis
Faraday’s laws of electrolysis
Cell and batteries
Lead acid battery
Nickel iron battery
Charging of battery
Discharging of battery
Grouping of cells
Efficiency of a battery
Ampere-hour efficiency
Precautions /maintenance of storage batteries
Exercises
8 Electrostatics
Static electricity
Electric charge, positive charge and negative charge
Electric field
Electric intensity or field strength
Electric flux
Electric flux density
Electric potential
Electrical potential difference
Potential gradient
Force between parallel conductors
Dielectric strength or breakdown voltage
Uses of dielectrics
Capacitor
Factors affecting capacitance
Types of capacitors
Variable capacitors
Series and parallel combination of capacitors
Charging of a capacitor
Discharging of a capacitor
Exercises
Index