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1、2.4《电源的电动势和内阻闭合电路欧姆定律》教案2.4theelectromotiveforceandinternalresistanceofthepowersupplyclosedcircuitOhm，slawTeachingtarget(1)knowledgeandskills1.itisknownthatEMFandinternalresistancearephysicalquantitiesthatcharacterizethecharacteristicsofthepowersupply.U=E-Irtherelationshipbetweentheterm
2、inalvoltageandelectromotiveforce2.understandingpower,duetotheelectromotiveforceofthepowersupplyterminalvoltagedifferencewillexplainthemeasured・3.understandOhm，slawofclosedcircuitanduseittocalculatecircuitandcircuitproblem・(two)processandmethod1.,thecreationoftheenvironment,sothatstudent
3、scanfindproblemsandcontradictionsfromthedifferences,fromtheexperimentalinquirytounderstandtheconceptofphysicsputforward.2.byusingimageanalysisformula,theterminalvoltagevarieswiththevariationoftheexternalresistance,usingavarietyofmethodscultivatingstudents'abilitytoanalyzeproblems・(three
4、)emotion,attitudeandvalues1.,theanalysisofthechangesofIandUcausedbythechangeoftheexternalresistanceandtheestablishmentofauniversalcorrelationbetweenthings2.,throughtheanalysisandcalculationofclosedcircuit,traintheideaofenergyconservationofstudentsTeachingemphasesanddifficultiesThe1.poin
5、t:1.Understandthephysicalmeaningofelectromotiveforcecorrectly;2.UnderstandandapplytheOhmlawofclosedcircuit2.difficulties:theterminalvoltageandcurrentlawchangeswiththeexternalresistance・Teachingprocess:(1)introducingnewcoursesQ:howdoyoumakesmallbulbslightup?(answer:powersupply,voltage,cu
6、rrent,etc・)Demonstration:equippedwithanoldbatteryflashlight,presstheswitchisnotbright,measuringthebatteryatbothendsofthevoltage;newbattery,presstheswitchwhenthelight,measuringthebatteryatbothendsofthevoltage,butolderthanthebattery.Theoldbatteryhasvoltage・Whydoesn，ttheflashlightgoon?(two
7、)newcourseteaching1.powerEMF(1)thefunctionofpowersupply;Projection:thedischargeofthecapacitorcharging,readinggalvanometerdecreasesgradually,andfinallydisappeared;Thebatterydischarge,meterreadingcanremainstableforalongtime・Studentsreferto〃P・55-56〃forrelevantcontent,discussandans
