AGA XH0175 : 1987

I INTRODUCTION
     Historical Background on Discovery of Electricity
     Use of Gas and Electricity Together to Improve the Way of
     Life for Everyone
II HOW ELECTRICITY IS SUPPLIED
     Potential Difference or Electromotive Force (EMF) or
     Voltage
     Devices to Provide an Electromotive Force or Voltage
        The Chemical Cell or Battery
        Mechanical Generators
        Thermoelectric Sources of Voltage
        Piezoelectric Sources of Voltage
III ELECTRICAL TERMS
     The Volt
        Millivolt Systems
        24 Volt Systems
        120 Volt, 240 Volt Systems
        High Voltages
     The Ampere
     The Ohm
        Conductors
        Resistors
        Insulators
     Capacitance
     Inductance
     The Watt (Electrical Power)
IV ELECTRICAL RELATIONSHIPS
     Ohm's Law
     Series and Parallel Circuits
        Series Circuits
        Parallel Circuits
     Impedance
     Watt's Law
     Formula Circle
V BASIC ELEMENTS OF ELECTRICAL CIRCUITS
     Source
        Line Voltage Sources
        Thermoelectric Voltage Sources
     Current Control Devices - Switches and Resistors
        Electrical Switches
        Electrical Resistors
     Load
VI CIRCUIT COMPONENTS AND THEIR GRAPHIC SYMBOLS
     Receptacles and Plugs
     Thermocouples and Thermopiles
     Lines and Connections
     The Fuse and the Circuit Breaker
        Fuse
        Circuit Breaker
     Ground
     Switches
     Switch Poles and Throws
        Single Pole - Single Throw Switch
        Single Pole - Double Throw Switch
        Double Pole - Single Throw Switch
        Double Pole - Double Throw Switch
     Methods of Actuating Switches
        Manual Switches
        Mechanically Actuated Switches
        Pressure Actuated Switches
        Temperature Actuated Switches
        Electromagnetically Actuated Switches (Relays)
     Normally Open or Normally Closed Switches
     Electrical Resistors
        Fixed Resistors
        Variable Resistors
     Rectifiers
     Load Components in Electrical Circuits
        Resistive Components
           The Incandescent Light
           Resistive Heating Elements
           Hot Body Ignitors
        Capacitors
        Transformers
        Spark Gap
           Fluorescent Lamps and Ballasts
           Bells and Buzzers
           Motors
           Motor Starters and Start Switches
           Solenoids
VII ELECTRICAL CIRCUIT DIAGRAMS
     Connection Diagram
     Schematic Diagram
VIII POLARITY
     Hot and Neutral Lines
     How to Determine Polarity
IX TEST EQUIPMENT
     Test Lights
        Filament Bulb Test Light
        Neon Test Light
     Jumper Wire
     Continuity Tester
     Volt-Ohm Meter
        The Voltmeter
        The Ohmmeter
        Use of Volt Ohmmeter
        The Ammeter
     Millivoltmeter
        Open Circuit Voltage
        Closed Circuit Voltage
X APPLICATION
     DC Millivolt Circuits
        Single Thermocouple Systems
        Thermopile Systems
     Low Voltage Circuits
     Line Voltage Circuits
        Limit Controls, Thermostats and Automatic
        Gas Control Valves
        Motors
        Timer Circuits
XI ELECTRICAL SAFETY
     REFERENCE SOURCES
     GLOSSARY
     APPENDIX Graphic Symbols of Some Items Extracted From
              ANSI Y32.2 - 1970, Graphic Symbols for Electrical
              and Electronic Diagrams and Abbreviations for
              These Items