FundamentalsofElectricCircuitsWhyelectriccircuitstheoryisimportant?FundamentaltheoryuponwhichallbranchesofelectricalengineeringarebuiltGoodmodelforthestudyofenergysystemsingeneralStudyMethods:Putinasmucheffortasyoucan(Studythecourseregularly)SolveasmanyproblemsasyoucanNotice:TwohomeworkassignmentscanbemissedCollaborationpolicyHomeworkYoumaycollaboratewithothers,butdoyourownwrite-upLabYoumayworkinateam,butdoyourownwrite-upChapter1BasicConcepts1.1IntroductionAsimpleelectriccircuit1.2SystemsofUnits1.3ChargeandCurrentDirectionofCurrentFlow:1.4VoltageKeepinmind:1.5PowerandEnergyLawofconservationofenergy:1.6CircuitElementsAnidealindependentsourceisanactiveelementthatprovidesaspecifiedvoltageorcurrentthatiscompletelyindependentofothercircuitvariablesAnidealdependent(orcontrolled)sourceisanactiveelementinwhichthesourcequantityiscontrolledbyanothervoltageorcurrent1.7SummaryPoweristheenergysuppliedorabsorbedperunittime.Itisalsotheproductofvoltageandcurrent.Accordingtothepassivesignconvention,powerassumesapositivesignwhenthecurrententersthepositivepolarityofthevoltageacrossanelement.Anidealvoltagesourceproducesaspecificpotentialdifferenceacrossitsterminalregardlessofwhatisconnectedtoit.Anidealcurrentsourceproducesaspecificcurrentthroughitsterminalsregardlessofwhatisconnectedtoit.Voltageandcurrentsourcescanbedependentorindependent.Adependentsourceisonewhosevaluedependsonsomeothercircuitvariable.