Table of Contents
I.INTRODUCTION
HistoricalBackgroundonDiscoveryofElectricity
UseofGasandElectricityTogethertoImprovetheWayof
LifeforEveryone
CHAPTERREVIEW
II.HOWELECTRICITYISSUPPLIED
PotentialDifference,ElectromotiveForce(EMF)orVoltage
DevicestoProvideanElectromotiveForce(Voltage)
TheChemicalCellorBattery
MechanicalGenerators
ThermoelectricSourcesofVoltage
PiezoelectricSourcesofVoltage
CHAPTERREVIEW
III.ELECTRICALTERMS
TheVolt
MillivoltSystems(DC)
24-VoltSystems
120-Volt,240-VoltSystems
HighVoltages
TheAmpere
TheOhm
Conductors
Resistors
Insulators
Capacitance
Inductance
TheWatt(ElectricalPower)
CHAPTERREVIEW
IV.ELECTRICALRELATIONSHIPS
Ohm'sLaw
SeriesandParallelCircuits
SeriesCircuits
ParallelCircuits
Impedance
Watt'sLaw
FormulaCircle
CHAPTERREVIEW
V.BASICELEMENTSOFELECTRICALCIRCUITS
Source
LineVoltageSources
ThermoelectricVoltageSources
CurrentControlDevices-SwitchesandResistors
ElectricalSwitches
ElectricalResistors
Load
CHAPTERREVIEW
VI.CIRCUITCOMPONENTSANDTHEIRGRAPHICSYMBOLS
ReceptaclesandPlugs
ThermocouplesandThermopiles
LinesandConnections
TheFuseandtheCircuitBreaker
Fuse
CircuitBreaker
Ground
GroundFaultCircuitInterrupterorGFI
Switches
SwitchPolesandThrows
SinglePole-SingleThrowSwitch(SPST)
SinglePole-DoubleThrowSwitch(SPDT)
DoublePole-SingleThrowSwitch(DPST)
DoublePole-DoubleThrowSwitch(DPDT)
MethodsofActuatingSwitches
ManualSwitches
MechanicallyActuatedSwitches
PressureActuatedSwitches
TemperatureActuatedSwitches
ElectromagneticallyActuatedSwitches(Relays)
NormallyOpenorNormallyClosedSwitches
ElectricalResistors
FixedResistors
VariableResistors
Rectifiers
LoadComponentsinElectricalCircuits
ResistiveComponents
TheIncandescentLight
ResistiveHeatingElements
HotSurfaceIgnitors
Capacitors
Transformers
SparkGap
FluorescentLampsandBallasts
BellsandBuzzers
Motors
MotorStartersandStartSwitches
Solenoids
CHAPTERREVIEW
VII.ELECTRICALCIRCUITDIAGRAMS
ConnectionDiagram
SchematicDiagram
CHAPTERREVIEW
VIII.POLARITY
HotandNeutralLines
HowtoDeterminePolarity
CHAPTERREVIEW
IX.TESTEQUIPMENT
TestLights
FilamentBulbTestLight
NeonTestLight
JumperWire
ContinuityTester
Volt-OhmMeter
TheVoltmeter
TheOhmmeter
UseofVoltOhmmeters
TheAmmeter
Millivoltmeter
OpenCircuitVoltage
ClosedCircuitVoltage
CHAPTERREVIEW
X.APPLICATION
DCMillivoltCircuits
SingleThermocoupleSystems
ThermopileSystems
LowVoltageCircuits
LineVoltageCircuits
LimitControls,ThermostatsandAutomaticGasControlValves
Motors
TimerCircuits
CHAPTERREVIEW
XI.ELECTRICALSAFETY
CHAPTERREVIEW
ANSWERSTOCHAPTERREVIEWS
REFERENCES
GLOSSARY
APPENDIXGraphicsymbolsofSomeItemsExtractedFrom
ANSIY32.21975,GraphicSymbolsforElectrical
andElectronicDiagramsandAbbreviationsforThese
Items Abstract
Includes how electricity is supplied, electrical terms, electrical relationships, basic elements of electrical circuits circuit components and their graphic symbols, polarity and test equipment. Provides assistance to vocational-technical schools, appliance service and repairmen and utility employees.
