电路基础ppt课件第1章电路模型和电路定律

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1、Chapter1CircuitmodelandcircuitlawsCircuit&circuitmodel1.1Resistance1.5Current&voltagereferencedirection1.2Voltage¤tsources1.6Electricpowerandenergy1.3Controlledsource1.7Devices1.4Kirchhoff’slaw1.8firstpageKeystone1.Voltageandcurrentreferencedirection3.Kirchhoff’sl

2、awkeystone：2.ThepropertiesofresistanceandpowersupplyReturn1.1circuitandcircuitmodel1.PracticalcircuitToaexpectantaim,design,linkandinstallwiringtoformcurrent.nextbackreturnleadbatteryswitchbulbThesimplecircuitofpracticelighting.Therearethreeparts:1）powerorinput:providet

3、heenergysource（e.g.batteryorexcitation），convertotherformalenergyintoelectricity.2）load:equipment（e.g.light），converttheelectricityintootherforms。3）lead:providecurrentloop,thevoltageandcurrentincircuitiscalledresponse.functiona.transfer,distributeandconvertenergyb.pass,co

4、ntrolandprocessinformationBasedonthesamecircuittheorycommonness1.PracticalcircuitThecombinationofidealdevicesreflectingpracticecircuitperformance.2.CircuitmodelleadbatteryswitchbulbCircuitdiagramIdealdevicesAkindofassuredelectromagnetismperformanceidealdeviceCircuitmode

5、lNextbackreturn5kindsofidealdevices：Resistor：denoteselementwhichconsumeselectricity.Inductor：denoteselementwhichproducesmagneticfieldandsavesitsenergy.Capacitor：denoteselementwhichproduceselectricfieldandsavesitsenergy.Voltage¤tsource：denoteselementwhichconvertsot

6、herformenergyintoelectricenergy.Therearethreeproperties:（a）onlytwoterminals；（b）depictinmathofvoltageorcurrent(volt-ampererelation)；（c）can’tbedecomposedothers.nextbackNotes:return具有相同的主要电磁性能的实际电路部件，在一定条件下可用同一电路模型表示；同一实际电路部件在不同的应用条件下，其电路模型可以有不同的形式。nextbacke.g.电感线圈的电路模型Not

7、es:return1.2currentandvoltagereferencedirection电路中的主要物理量有电压U、电流I、电荷Q、磁链Ψ、能量W、电功率P等。在线性电路分析中人们主要关心的物理量是电流、电压和功率。1.CurrentreferencedirectionElectriccurrentCurrentintensityAbeamedflowofelectriccharge.TheamountofelectricchargeflowingpastaspecifiedcircuitpointperunittimeNext

8、backreturnDirectionPrescribethemovementdirectionofpositivechargeascurrentpracticeoneUnit1kA=103A1mA=10-3A1A=1