新加坡初二科学物理

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1、.NameS.IunitSymbolCurrent(I)AmphereAVoltage(V)VoltsVResistance(R)OhmsnElectricEnergy(E)JoulejPower(P)WattwAmountofcharge(Q)CoulombcComponentSymbolComponentSymbolCellFuseBatteriesAmmeterLightbulbVoltmeterOpenswitchClosedswitchResistorVariableresistorOpe

2、ncircuitClosedcircuit~calledincomplete~noelectricityflowsinthecircuit~maycausedbyfaultyworkingdevicesorabreakintheprotectivedevices~calledacompletecircuitswitchisclosedhencethecircuitiscomplete^electricityflowscontinuouslyCategoryWhatis汁？ExampleUsesine

3、lectricityConductorsMaterialsthatallowelectricitytopassthroughthemeasilyCopperSilverOthermetalsCopperisusedastheconductingwire・InsulatorsMaterialsthatdonotallowelectricitytopassthroughthemPlasticRubberGlassFibresWoodPlasticorrubberisusedasprotectivelay

4、ersonthewires.ResistorsMaterialsthatlimitorregulatetheamountofelectricitypassingthroughthem.Convertelectricalenergyintootherformsofenergy.Nichromewhichismadeonickelandchromium.Nichromeisusedastheheatingelementtoconvertelectricalenergyintoheatenergy.Ser

5、iesCircuitParallelCircuit~Theloadsarearrangedoneafteroneinasinglelooporbranch・Thereisonlyonepathforelectricitytoflowthrough・~Theadvantageofaseriescircuitisitissimpletobuild.~Aseriescircuithastwodisadvantages：・Whenmoreloadsareadded,thetotalresistanceint

6、hecircuitincreases.-Whenoneloadisdamaged,itaffectsthefunctionalityoftheotherloads・~Theloadsarearrangedinmultipleloopsorbranches.~Therearemorethanonepathforelectricitytoflowthrough.~Aparallelcircuithastwoadvantages：-Whenmoreloopsareadded,thetotalresista

7、nceinthecircuitdecreases・-Whenoneloadisdamaged,itdoesnotaffectthefunctionalityoftheotherloops.Current~Electriecurrentistherateofflowofelectriccharges.~Theflowofelectronsfromnegativeterminaltothepositiveterminalofapowersourceiscalledelectronflow.~Thecon

8、ventionalcurrentmodelisusedinindicatethedirectionofelectriccurrentinacircuit.Electriccurrentflowsfromthepositiveterminaltothenegativeterminalofthepowersourceinacircuit.I=Q/TCurrent=Amountofcharge/TimeAmmeterisaninstrumentusedtomeasureel