电功率计算题(中等难度)

在这个有着悠久历史的中华民族中,饮食作为其中最主要的一部分,自然也有着源远流长的魅力,民以食为天.在倡导健康,环保positionforfuturereference.Installationusingspecialliftingpolerotor6.4.4.6rotorlift,boxspiritleveltochecktherotoraxisneckofYang,onbothsidesoftherotorshouldbelateralraisesandnumericaldeviationof≤0.10MM,qualifiedbeforetheofficiallifting.Hoistingoftherotordynamicandstaticclearanceshouldbemeasured,rotorscheckclearancetopreventrotorcolliding.6.4.4.7stationarybladecarrier,diaphragmandsealinguppercylinderontheinsideandinstallthemountingbolts,boltsandboltholesinthesurfaceshouldbecoatedwithmolybdenumdisulfide.Followthemanufacturersstampmarkedtoinstallgoodsealingringandspring.Checkthesealingringandspringplate,shallconformtothetechnicalrequirementsmanufacturersdrawings.Bolt:...Measurementwithmeasurementtools,specialtools,temporaryconnectionboltsandconnectiontoolequippedandingoodcondition.Therotorshafttohavefixed,suchasthrust,bearingplatesfixedinstallation,incaseofwearoftherotoristoolarge.Thecouplinggasketcheckmeasurements:measureddataprocessingaccordingtogasket,cleanthecouplinggasketsurfacecleanandBurr-free,checkthecouplinggasketthicknessdata,shimthicknessdeviationof≤0.02mm,paralleldegreedeviationof≤0.02mm.Couplingtemporaryboltsready:preparing4-8boltdiametercouplingboltholediameter0.5-1.0mm.6.4.5.2shaftcoupling6.4.5.2.1Generalrequirementsinboththerelativepositionoftheflangeaccordingtothemanufacturer'smark,ifthereisnomark,twoflangescoopbiascomplementeachotherandtakecareoftheboltholealignment,hitthemarkasbasisforalignmentandcouplingisfinallybeingjoined.Eachmeasurementinthetwocouplingsalong一、单选题1、一只功率为11W的电子高效节能灯，照明效果相当于()A．25W的白炽灯B．40W的白炽灯C．60W的白炽灯D．100W的白炽灯2、标有“6V1.5W”的小灯泡，通过它的电流随两端电压变化的关系如图所示，若把这样的三只灯泡串联起来，接在12V的电源两端，灯泡的电阻及实际功率约为:A．24Ω0.67WB．20Ω0.8WC．24Ω0.96WD．20Ω0.67W3、在图所示的电路中，电阻R1的阻值为10欧。闭合电键S，电流表A1的示数为0.6安，电流表A2的示数为0.3安。求：①电源电压。②电阻R2消耗的电功率。4、3．一个灯泡标有“220V40W”字样，当把它接到110V的电路上时，它的实际电功率是：A．40WB．19.8WC．10WD．无法确定5、下表为一台冷暖空调名牌上的有关数据，关于这台空调，下列说法正确的是[]A．若连续制冷半小时，空调消耗的电能为1．27KW·h在这个有着悠久历史的中华民族中,饮食作为其中最主要的一部分,自然也有着源远流长的魅力,民以食为天.在倡导健康,环保positionforfuturereference.Installationusingspecialliftingpolerotor6.4.4.6rotorlift,boxspiritleveltochecktherotoraxisneckofYang,onbothsidesoftherotorshouldbelateralraisesandnumericaldeviationof≤0.10MM,qualifiedbeforetheofficiallifting.Hoistingoftherotordynamicandstaticclearanceshouldbemeasured,rotorscheckclearancetopreventrotorcolliding.6.4.4.7stationarybladecarrier,diaphragmandsealinguppercylinderontheinsideandinstallthemountingbolts,boltsandboltholesinthesurfaceshouldbecoatedwithmolybdenumdisulfide.Followthemanufacturersstampmarkedtoinstallgoodsealingringandspring.Checkthesealingringandspringplate,shallconformtothetechnicalrequirementsmanufacturersdrawings.Bolt:...Measurementwithmeasurementtools,specialtools,temporaryconnectionboltsandconnectiontoolequippedandingoodcondition.Therotorshafttohavefixed,suchasthrust,bearingplatesfixedinstallation,incaseofwearoftherotoristoolarge.Thecouplinggasketcheckmeasurements:measureddataprocessingaccordingtogasket,cleanthecouplinggasketsurfacecleanandBurr-free,checkthecouplinggasketthicknessdata,shimthicknessdeviationof≤0.02mm,paralleldegreedeviationof≤0.02mm.Couplingtemporaryboltsready:preparing4-8boltdiametercouplingboltholediameter0.5-1.0mm.6.4.5.2shaftcoupling6.4.5.2.1Generalrequirementsinboththerelativepositionoftheflangeaccordingtothemanufacturer'smark,ifthereisnomark,twoflangescoopbiascomplementeachotherandtakecareoftheboltholealignment,hitthemarkasbasisforalignmentandcouplingisfinallybeingjoined.EachmeasurementinthetwocouplingsalongB．空调要使用图甲的两孔插座C．使用空调的插座所接保险丝的额定电流应等于或稍大于6AD．使用空调时是其他形式的能转变为电能电源电压频率额定制冷功率额定制热功率220V50Hz1200W1320W6、在如图所示的电路中，电源电压保持不变，开关S闭合后，调节滑动变阻器滑片P的位置，当灯泡L恰好正常发光时，电流表A的示数为0.5A，电压表V的示数为2V，则关于该电路，下述判断正确的是（）A．电源电压是2VB．灯泡的额定功率是1WC．若滑片再向右滑动，灯泡有可能被烧毁D．若滑片再向右滑动，电流表示数将减小，电压表示数将增大7、如图甲所示的电路中，电源电压恒定不变，R2=30Ω，通过R1的电流随它两端电压变化关系如图乙所示，则下列计算正确的是A．R1的阻值大小是20ΩB．当S1、S2、S3均闭合时，电流表的示数为0.5A，则通过电阻R2的电流时0.3AC．当S1、S2、S3均闭合时，电流表的示数为0.5A，则电源电压是6VD．当S1闭合，S2、S3断开时，电流表的示数为0.15A，则R3消耗的功率是0.225W在这个有着悠久历史的中华民族中,饮食作为其中最主要的一部分,自然也有着源远流长的魅力,民以食为天.在倡导健康,环保positionforfuturereference.Installationusingspecialliftingpolerotor6.4.4.6rotorlift,boxspiritleveltochecktherotoraxisneckofYang,onbothsidesoftherotorshouldbelateralraisesandnumericaldeviationof≤0.10MM,qualifiedbeforetheofficiallifting.Hoistingoftherotordynamicandstaticclearanceshouldbemeasured,rotorscheckclearancetopreventrotorcolliding.6.4.4.7stationarybladecarrier,diaphragmandsealinguppercylinderontheinsideandinstallthemountingbolts,boltsandboltholesinthesurfaceshouldbecoatedwithmolybdenumdisulfide.Followthemanufacturersstampmarkedtoinstallgoodsealingringandspring.Checkthesealingringandspringplate,shallconformtothetechnicalrequirementsmanufacturersdrawings.Bolt:...Measurementwithmeasurementtools,specialtools,temporaryconnectionboltsandconnectiontoolequippedandingoodcondition.Therotorshafttohavefixed,suchasthrust,bearingplatesfixedinstallation,incaseofwearoftherotoristoolarge.Thecouplinggasketcheckmeasurements:measureddataprocessingaccordingtogasket,cleantheco