色环电阻器测试题

1.有一五色环电阻器，该电阻器的颜色为棕黑黑棕棕。这个电阻的标称阻值为（）A.HTMLCONTROLForms.HTML:Option.11000ΩB.HTMLCONTROLForms.HTML:Option.1110ΩC.HTMLCONTROLForms.HTML:Option.1100ΩD.HTMLCONTROLForms.HTML:Option.111ΩA2.四环电阻，若色环依次为绿、棕、红、金，则该电阻的阻值为（）A.HTMLCONTROLForms.HTML:Option.15.1kΩB.HTMLCONTROLForms.HTML:Option.151kΩC.HTMLCONTROLForms.HTML:Option.16.1kΩD.HTMLCONTROLForms.HTML:Option.161kΩA3.用三位数字332标注某电阻阻值时，代表该电阻的阻值为（）A.HTMLCONTROLForms.HTML:Option.13.3kΩB.HTMLCONTROLForms.HTML:Option.13.3ΩC.HTMLCONTROLForms.HTML:Option.1332ΩD.HTMLCONTROLForms.HTML:Option.1332kΩA4.有一四色环电阻器，该电阻器的颜色为黄紫红金。这个电阻的标称阻值为（）A.HTMLCONTROLForms.HTML:Option.14.7kΩB.HTMLCONTROLForms.HTML:Option.147kΩC.HTMLCONTROLForms.HTML:Option.13.6kΩD.HTMLCONTROLForms.HTML:Option.1360ΩA5.有一五色环电阻器，该电阻器的颜色为橙橙红红棕。这个电阻的标称阻值为（）A.HTMLCONTROLForms.HTML:Option.133.2kΩB.HTMLCONTROLForms.HTML:Option.1332kΩC.HTMLCONTROLForms.HTML:Option.12.21kΩD.HTMLCONTROLForms.HTML:Option.1221ΩA6.有一贴片电阻标注为104，则该电阻的阻值为（）A.HTMLCONTROLForms.HTML:Option.110kΩB.HTMLCONTROLForms.HTML:Option.1100kΩC.HTMLCONTROLForms.HTML:Option.1104ΩD.HTMLCONTROLForms.HTML:Option.1104kΩB7.某色码电感颜色为棕黑金金，则该电感器的标称电感量为（）A.HTMLCONTROLForms.HTML:Option.10.1μHB.HTMLCONTROLForms.HTML:Option.11μHC.HTMLCONTROLForms.HTML:Option.11pHD.HTMLCONTROLForms.HTML:Option.110pHB8.某电感器标注为151，则该电感器的标称电感量为（）A.HTMLCONTROLForms.HTML:Option.1151μHB.HTMLCONTROLForms.HTML:Option.1150μHC.HTMLCONTROLForms.HTML:Option.1151pHD.HTMLCONTROLForms.HTML:Option.1150pHB9.用三位数字223标注某电容容量时，代表该电容的容量为（）A.HTMLCONTROLForms.HTML:Option.1223pFB.HTMLCONTROLForms.HTML:Option.122nFC.HTMLCONTROLForms.HTML:Option.1223μFD.HTMLCONTROLForms.HTML:Option.122mFB10.标注为4n7的电容器，其电容值为（）A.HTMLCONTROLForms.HTML:Option.147nFB.HTMLCONTROLForms.HTML:Option.14.7nFC.HTMLCONTROLForms.HTML:Option.174nFD.HTMLCONTROLForms.HTML:Option.17.4nFB11.标注为243的电容器，其电容值为（）A.HTMLCONTROLForms.HTML:Option.1243pFB.HTMLCONTROLForms.HTML:Option.124μFC.HTMLCONTROLForms.HTML:Option.124nFD.HTMLCONTROLForms.HTML:Option.1240nFC12.焊接元器件应按照顺序进行。（）A.HTMLCONTROLForms.HTML:Option.1先高后低，先大后小B.HTMLCONTROLForms.HTML:Option.1先高后低，先小后大C.HTMLCONTROLForms.HTML:Option.1先低后高，先小后大D.HTMLCONTROLForms.HTML:Option.1任意C13.拆卸元器件可以使用电烙铁及__。（）A.HTMLCONTROLForms.HTML:Option.1剥线钳B.HTMLCONTROLForms.HTML:Option.1螺丝刀C.HTMLCONTROLForms.HTML:Option.1吸锡器D.HTMLCONTROLForms.HTML:Option.1镊子C14.发现某个元件焊不上，可以。（）A.HTMLCONTROLForms.HTML:Option.1多加助焊剂B.HTMLCONTROLForms.HTML:Option.1延长焊接时间C.HTMLCONTROLForms.HTML:Option.1清理引线表面，认真镀锡后再焊D.HTMLCONTROLForms.HTML:Option.1多加松香C15.质量好的焊点看上去呈。（）A.HTMLCONTROLForms.HTML:Option.1大小均匀，表面粗糙，呈扁平锥形B.HTMLCONTROLForms.HTML:Option.1大小均匀，表面光洁，呈球形C.HTMLCONTROLForms.HTML:Option.1大小均匀，表面光洁，呈扁平锥形D.HTMLCONTROLForms.HTML:Option.1大小均匀，表面粗糙，呈球形C16.测量电压时，万用表要在被测电路中。（）A.HTMLCONTROLForms.HTML:Option.1均不能B.HTMLCONTROLForms.HTML:Option.1串联C.HTMLCONTROLForms.HTML:Option.1串联和并联D.HTMLCONTROLForms.HTML:Option.1并联D17.测量电流时，万用表要在被测电路中。（）A.HTMLCONTROLForms.HTML:Option.1均不能B.HTMLCONTROLForms.HTML:Option.1并联C.HTMLCONTROLForms.HTML:Option.1串联和并联D.HTMLCONTROLForms.HTML:Option.1串联D18.万用表DCA档位用来测量。（）A.HTMLCONTROLForms.HTML:Option.1交流电流B.HTMLCONTROLForms.HTML:Option.1交流电压C.HTMLCONTROLForms.HTML:Option.1直流电压D.HTMLCONTROLForms.HTML:Option.1直流电流D19.万用表ACV档位用来测量。（）A.HTMLCONTROLForms.HTML:Option.1直流电压B.HTMLCONTROLForms.HTML:Option.1直流电流C.HTMLCONTROLForms.HTML:Option.1交流电流D.HTMLCONTROLForms.HTML:Option.1交流电压D20.用数字万用表档可以判断二极管的极性及好坏。（）A.HTMLCONTROLForms.HTML:Option.1电阻档B.HTMLCONTROLForms.HTML:Option.1电压档C.HTMLCONTROLForms.HTML:Option.1电流档D.HTMLCONTROLForms.HTML:Option.1二极管档D21.在直流电路中，已知VA=3V，UAB=5V则VB=。（）A.HTMLCONTROLForms.HTML:Option.1-2VB.HTMLCONTROLForms.HTML:Option.1-8VC.HTMLCONTROLForms.HTML:Option.12VD.HTMLCONTROLForms.HTML:Option.18VA22.在直流电路中，已知VA=13V，UAB=5V，则VB=。（）A.HTMLCONTROLForms.HTML:Option.18VB.HTMLCONTROLForms.HTML:Option.1-2VC.HTMLCONTROLForms.HTML:Option.12VD.HTMLCONTROLForms.HTML:Option.1-8VA23.“220V、40W”的电灯L1接到220V电路上，“36V、40W”的电灯L2接到36V电路上，则（）。A.HTMLCONTROLForms.HTML:Option.1一样亮B.HTMLCONTROLForms.HTML:Option.1L1较亮C.HTMLCONTROLForms.HTML:Option.1L2较亮D.HTMLCONTROLForms.HTML:Option.1无法确定A24.理想电压源的内阻为Ω。（）A.HTMLCONTROLForms.HTML:Option.10ΩB.HTMLCONTROLForms.HTML:Option.1∞ΩC.HTMLCONTROLForms.HTML:Option.1100ΩD.HTMLCONTROLForms.HTML:Option.11000ΩA25.理想电流源的内阻为Ω。（）A.HTMLCONTROLForms.HTML:Option.1∞ΩB.HTMLCONTROLForms.HTML:Option.10ΩC.HTMLCONTROLForms.HTML:Option.1100ΩD.HTMLCONTROLForms.HTML:Option.11000ΩA26.图1中，R1=R2=R3=5Ω，I1=2A，I3=-3A，则Uab=V。（）A.HTMLCONTROLForms.HTML:Option.1-5VB.HTMLCONTROLForms.HTML:Option.15VC.HTMLCONTROLForms.HTML:Option.110VD.HTMLCONTROLForms.HTML:Option.150VB27.图1中，R1=R2=R3=5Ω，I1=2A，I3=-3A，则Ubc=V。（）A.HTMLCONTROLForms.HTML:Option.110VB.HTMLCONTROLForms.HTML:Option.120VC.HTMLCONTROLForms.HTML:Option.1-20VD.HTMLCONTROLForms.HTML:Option.1-10VB图1中，R1=R2=R3=5Ω，I2=-1A，I3=-3A，则Uac=V。（）A.HTMLCONTROLForms.HTML:Option.18VB.HTMLCONTROLForms.HTML:Option.125VC.HTMLCONTROLForms.HTML:Option.1-25VD.HTMLCONTROLForms.HTML:Option.1-8VB29.在图2中，已知I1=4A，I2=-2A，I3=1A，I4=-3A，则I5=A。（）A.HTMLCONTROLForms.HTML:Option.15AB.HTMLCONTROLForms.HTML:Option.110AC.HTMLCONTROLForms.HTML:Option.150AD.HTMLCONTROLForms.HTML:Option.1-5AB30.在图3中，已知Ia=1mA，Ib=10mA，Ic=2mA，则Id=mA。（）A.HTMLCONTROLForms.HTML:Option.113B.HTMLCONTROLForms.HTML:Option.1-13C.HTMLCONTROLForms.HTML:Option.1-7D.HTMLCONTROLForms.HTML:Option.17B31．图4电路中，IS=3A，R0=20Ω，I=2A，则R为。（）A.HTMLCONTROLForms.HTML:Option.130ΩB.HTMLCONTROLForms.HTML:Option.120ΩC.HTMLCONTROLForms.HTML:Option.110ΩD.HTMLCONTROLForms.HTML:Option.15ΩC32.有5个阻值相同的电阻，并联后接在20V的电源上，测得总电流为0.5A，则各电阻消耗的功率分别为瓦。（）A.HTMLCONTROLForms.HTML:Option.120B.HTMLCONTROLForms.HTML:Option.110C.HTMLCONTROLForms.HTML:Option.12D.HTMLCONTROLForms.HTML:Option.150C33.有10个5Ω的电阻，其中5个相串联，阻值为RA，另5个电阻相并联，其阻值为RB，则RA+RB=。（）A.HTMLCONTROLForms.HTML:Option.125ΩB.HTMLCONTROLForms.HTML:Option.150ΩC.HTMLCONTROLForms.HTML:Option.126ΩD.HTMLCONTROLForms.HTML:Option.127ΩC34.有10个5Ω的电阻，其中5个相串联，阻值为RA，另5个电阻相并联，其阻值为RB，则RA与RB相并联时的电阻为。（）A.HTMLCONTROLForms.HTML:Option.125ΩB.HTMLCONTROLForms.HTML:Option.126ΩC.HTMLCONTROLForms.HTML:Option.125/26ΩD.HTMLCONTROLForms.HTML:Option.126/25ΩC35.有一盏220V，60W的电灯，接在220V的电源上，如果每晚用3小时，若每度电费0.5元，每月应支付的电费为元。（一月按30天计）。（）A.HTMLCONTROLForms.HTML:Option.14.5B.HTMLCONTROLForms.HTML:Option.17.2C.HTMLCONTROLForms.HTML:Option.12.7D.HTMLCONTROLForms.HTML:Option.15.4C36.1度电可供“220V，40W”灯泡正常发光的时间是。（）A.HTMLCONTROLForms.HTML:Option.120hB.HTMLCONTROLForms.HTML:Option.140hC.HTMLCONTROLForms.HTML:Option.145hD.HTMLCONTROLForms.HTML:Option.125hD37.有一盏220V，60W的电灯，接在220V的电源上，如果每晚用3小时，灯泡一个月消耗电能为kWh（一月按30天计）。（）A.HTMLCONTROLForms.HTML:Option.14.5B.HTMLCONTROLForms.HTML:Option.16.8C.HTMLCONTROLForms.HTML:Option.18.6D.HTMLCONTROLForms.HTML:Option.15.4D38.一电器的额定值为PN=1W，UN=100V，现要接到200V的直流电路上工作，问应选下列电阻中的哪一个与之串联才能使该电器正常工作。（）A.HTMLCONTROLForms.HTML:Option.15KΩ、2WB.HTMLCONTROLForms.HTML:Option.110KΩ、0.5WC.HTMLCONTROLForms.HTML:Option.120KΩ、0.25WD.HTMLCONTROLForms.HTML:Option.110KΩ、1WD39.电炉丝断了，剪去了一段后，再接回原电路中使用则电炉的电功率将。（）A.HTMLCONTROLForms.HTML:Option.1不能确定B.HTMLCONTROLForms.HTML:Option.1不变C.HTMLCONTROLForms.HTML:Option.1变小D.HTMLCONTROLForms.HTML:Option.1变大D40.将“220V、1000W”的电炉接入到110V的电源上，此电炉实际消耗的功率为W。（）A.HTMLCONTROLForms.HTML:Option.12000B.HTMLCONTROLForms.HTML:Option.11000C.HTMLCONTROLForms.HTML:Option.1500D.HTMLCONTROLForms.HTML:Option.1250D41.图5所示电路中，VA=。（）A.HTMLCONTROLForms.HTML:Option.1VA＝－IR＋UsB.HTMLCONTROLForms.HTML:Option.1VA＝IR－USC.HTMLCONTROLForms.HTML:Option.1VA＝IR＋UsD.HTMLCONTROLForms.HTML:Option.1VA＝－IR－UsA42.按图6所示电路的参考方向，电源为。（）A.HTMLCONTROLForms.HTML:Option.1吸收功率B.HTMLCONTROLForms.HTML:Option.1发出功率C.HTMLCONTROLForms.HTML:Option.1吸收功率或发出功率D.HTMLCONTROLForms.HTML:Option.1不确定A43.一般金属导体具有正温度系数，当环境温度升高时，电阻值将。（）A.HTMLCONTROLForms.HTML:Option.1增大B.HTMLCONTROLForms.HTML:Option.1减少C.HTMLCONTROLForms.HTML:Option.1不变D.HTMLCONTROLForms.HTML:Option.1不确定A44.图7中，A点的电位Va为。（）A.HTMLCONTROLForms.HTML:Option.1－16VB.HTMLCONTROLForms.HTML:Option.116VC.HTMLCONTROLForms.HTML:Option.1－4VD.HTMLCONTROLForms.HTML:Option.1－10VA45.图8中，R2=R4，Uad=150V，Uce=-70V，则AB间的电压Uab为。（）A.HTMLCONTROLForms.HTML:Option.1220VB.HTMLCONTROLForms.HTML:Option.1180VC.HTMLCONTROLForms.HTML:Option.1150VD.HTMLCONTROLForms.HTML:Option.170VA46.有额定电压UN=220V，额定功率PN分别100W和25W的两只白炽灯泡，将其串联后接入220V的电源，其亮度情况是。（）A.HTMLCONTROLForms.HTML:Option.1PN=100W的白炽灯泡较亮B.HTMLCONTROLForms.HTML:Option.1PN=25W的白炽灯泡较亮C.HTMLCONTROLForms.HTML:Option.1两只灯泡一样亮D.HTMLCONTROLForms.HTML:Option.1两只灯泡都不亮B47.如图9所示电路中，电压U为。（）A.HTMLCONTROLForms.HTML:Option.1-6VB.HTMLCONTROLForms.HTML:Option.16VC.HTMLCONTROLForms.HTML:Option.18VD.HTMLCONTROLForms.HTML:Option.112VB48.如图10电路中，正确的关系式是。（）A.HTMLCONTROLForms.HTML:Option.1AB.HTMLCONTROLForms.HTML:Option.1BC.HTMLCONTROLForms.HTML:Option.1CD.HTMLCONTROLForms.HTML:Option.1DB49.如图11所示，正确的表达式是。（）A.HTMLCONTROLForms.HTML:Option.1U=ISR–EB.HTMLCONTROLForms.HTML:Option.1U=（I-IS）R–EC.HTMLCONTROLForms.HTML:Option.1U=（I+IS）R-ED.HTMLCONTROLForms.HTML:Option.1U=（I+IS）R+EB50.图12所示电路中，10A电流源的功率为。（）A.HTMLCONTROLForms.HTML:Option.1吸收300WB.HTMLCONTROLForms.HTML:Option.1产生300WC.HTMLCONTROLForms.HTML:Option.1吸收200WD.HTMLCONTROLForms.HTML:Option.1产生200WB51.在图13电路中，可调变阻器R获得最大功率的条件是。（）A.HTMLCONTROLForms.HTML:Option.1R=5ΩB.HTMLCONTROLForms.HTML:Option.1R=3ΩC.HTMLCONTROLForms.HTML:Option.1R=2ΩD.HTMLCONTROLForms.HTML:Option.1R=1.2ΩC52.在图14电路中，电阻2Ω中的电流I值应是。（）A.HTMLCONTROLForms.HTML:Option.10B.HTMLCONTROLForms.HTML:Option.12AC.HTMLCONTROLForms.HTML:Option.13AD.HTMLCONTROLForms.HTML:Option.16AC53.测得一有源二端网络开路电压UOC=6V，短路电流ISC=2A，设外接负载电阻RL=9Ω，则RL中的电流为。（）A.HTMLCONTROLForms.HTML:Option.12AB.HTMLCONTROLForms.HTML:Option.10.67AC.HTMLCONTROLForms.HTML:Option.10.5AD.HTMLCONTROLForms.HTML:Option.10.25AC54.叠加定理适用于。（）A.HTMLCONTROLForms.HTML:Option.1直流线性电路B.HTMLCONTROLForms.HTML:Option.1交流线性电路C.HTMLCONTROLForms.HTML:Option.1任何线性电路D.HTMLCONTROLForms.HTML:Option.1非线性电路C55.如图15所示，测R2两端电压发现U2=U，产生该现象的原因是。（）A.HTMLCONTROLForms.HTML:Option.1R1断路B.HTMLCONTROLForms.HTML:Option.1R2断路C.HTMLCONTROLForms.HTML:Option.1R1短路D.HTMLCONTROLForms.HTML:Option.1R2短路C56.如图16所示电路中，A点电位为V。（）A.HTMLCONTROLForms.HTML:Option.110VB.HTMLCONTROLForms.HTML:Option.115VC.HTMLCONTROLForms.HTML:Option.10D.HTMLCONTROLForms.HTML:Option.15VD57.如图17所示，等效电阻Rab为Ω。（）A.HTMLCONTROLForms.HTML:Option.111B.HTMLCONTROLForms.HTML:Option.18C.HTMLCONTROLForms.HTML:Option.16D.HTMLCONTROLForms.HTML:Option.17D58.如图18所示电路中，I=A。（）A.HTMLCONTROLForms.HTML:Option.13B.HTMLCONTROLForms.HTML:Option.1-3C.HTMLCONTROLForms.HTML:Option.12D.HTMLCONTROLForms.HTML:Option.1-2D59.如图19所示为某电路的一部分，已知Uab=0，则I=A。（）A.HTMLCONTROLForms.HTML:Option.10B.HTMLCONTROLForms.HTML:Option.1-3C.HTMLCONTROLForms.HTML:Option.12D.HTMLCONTROLForms.HTML:Option.11.6D60.电工仪表上标有许多符号，其中表示交流电压的是。（）A.HTMLCONTROLForms.HTML:Option.1VB.HTMLCONTROLForms.HTML:Option.1DCAC.HTMLCONTROLForms.HTML:Option.1DCAD.HTMLCONTROLForms.HTML:Option.1ACVD61.如要扩大电压表量程，应在表头线圈上。（）A.HTMLCONTROLForms.HTML:Option.1串联电阻B.HTMLCONTROLForms.HTML:Option.1并联电阻C.HTMLCONTROLForms.HTML:Option.1混联电阻D.HTMLCONTROLForms.HTML:Option.1都不是A62.为减小测量误差，在电压表和电流表表头的选择上应。（）A.HTMLCONTROLForms.HTML:Option.1电压表内阻大，电流表内阻小B.HTMLCONTROLForms.HTML:Option.1两者都小C.HTMLCONTROLForms.HTML:Option.1电压表内阻小，电流表内阻大D.HTMLCONTROLForms.HTML:Option.1两者都大A63.阻值不同的几个电阻并联后，其等效电阻值。（）A.HTMLCONTROLForms.HTML:Option.1比任何一个电阻小B.HTMLCONTROLForms.HTML:Option.1比任何一个电阻大C.HTMLCONTROLForms.HTML:Option.1为R0/nD.HTMLCONTROLForms.HTML:Option.1与最小电阻值相等A64.下面叙述正确的是。（）A.HTMLCONTROLForms.HTML:Option.1电压源和电流源变换前后内部不等效B.HTMLCONTROLForms.HTML:Option.1电压源和电流源不能等效变换C.HTMLCONTROLForms.HTML:Option.1电压源和电流源变换前后外部不等效D.HTMLCONTROLForms.HTML:Option.1以上3种说法都不正确A65.在图20所示电路中，当开关S断开时，Rab=Ω。（）A.HTMLCONTROLForms.HTML:Option.13.1B.HTMLCONTROLForms.HTML:Option.12C.HTMLCONTROLForms.HTML:Option.11.3D.HTMLCONTROLForms.HTML:Option.11A66.一个电源分别接上8Ω和2Ω的电阻时，两个电阻消耗的电功率相等，则电源的内阻为Ω。（）A.HTMLCONTROLForms.HTML:Option.18B.HTMLCONTROLForms.HTML:Option.14C.HTMLCONTROLForms.HTML:Option.12D.HTMLCONTROLForms.HTML:Option.11B67.在图20所示电路中，当开关S闭合时，Rab=Ω。（）A.HTMLCONTROLForms.HTML:Option.13.1B.HTMLCONTROLForms.HTML:Option.12C.HTMLCONTROLForms.HTML:Option.11.3D.HTMLCONTROLForms.HTML:Option.11B68.图21所示二端网络的戴维南等效电路的两参数US=V。（）A.HTMLCONTROLForms.HTML:Option.112B.HTMLCONTROLForms.HTML:Option.110C.HTMLCONTROLForms.HTML:Option.17D.HTMLCONTROLForms.HTML:Option.13B69.图21所示二端网络的戴维南等效电路的两参数RS=Ω。（）A.HTMLCONTROLForms.HTML:Option.12B.HTMLCONTROLForms.HTML:Option.10C.HTMLCONTROLForms.HTML:Option.11D.HTMLCONTROLForms.HTML:Option.10.5B70.由叠加原理可求得使图22所示电路中，Uab=0的US值为V。（）A.HTMLCONTROLForms.HTML:Option.110B.HTMLCONTROLForms.HTML:Option.18C.HTMLCONTROLForms.HTML:Option.15D.HTMLCONTROLForms.HTML:Option.13B71.电力网按其功能分为输电网和两大部分。（）A.HTMLCONTROLForms.HTML:Option.1发电网B.HTMLCONTROLForms.HTML:Option.1变电网C.HTMLCONTROLForms.HTML:Option.1配电网D.HTMLCONTROLForms.HTML:Option.1用电网C72.电力网按其功能分为和配电网两大部分。（）A.HTMLCONTROLForms.HTML:Option.1发电网B.HTMLCONTROLForms.HTML:Option.1变电网C.HTMLCONTROLForms.HTML:Option.1输电网D.HTMLCONTROLForms.HTML:Option.1用电网C73.万用表一般能进行、电流、电阻等电量参数的测量。（）A.HTMLCONTROLForms.HTML:Option.1电功率B.HTMLCONTROLForms.HTML:Option.1电能C.HTMLCONTROLForms.HTML:Option.1电压D.HTMLCONTROLForms.HTML:Option.1功率因数C74.电路是由电源、导线和三部分组成。（）A.HTMLCONTROLForms.HTML:Option.1电阻B.HTMLCONTROLForms.HTML:Option.1电压C.HTMLCONTROLForms.HTML:Option.1负载D.HTMLCONTROLForms.HTML:Option.1电流C75.电路通常有有载、和短路三种状态。（）A.HTMLCONTROLForms.HTML:Option.1截路B.HTMLCONTROLForms.HTML:Option.1通路C.HTMLCONTROLForms.HTML:Option.1开路D.HTMLCONTROLForms.HTML:Option.1无载C76.电路通常有有载、开路和三种状态。（）A.HTMLCONTROLForms.HTML:Option.1截路B.HTMLCONTROLForms.HTML:Option.1通路C.HTMLCONTROLForms.HTML:Option.1无载D.HTMLCONTROLForms.HTML:Option.1短路D77.在分析和计算电路时，常任意选定某一方向作为电压或电流的，当选定的电压或者电流方向与实际方向一致时，电压或电流为正值。（）A.HTMLCONTROLForms.HTML:Option.1选定方向B.HTMLCONTROLForms.HTML:Option.1关联方向C.HTMLCONTROLForms.HTML:Option.1非关联方向D.HTMLCONTROLForms.HTML:Option.1参考方向D78.指针式万用表的结构主要由显示部分、机械部分和三部分组成。（）A.HTMLCONTROLForms.HTML:Option.1表头B.HTMLCONTROLForms.HTML:Option.1量程转换C.HTMLCONTROLForms.HTML:Option.1开关部分D.HTMLCONTROLForms.HTML:Option.1电气部分D79.下列说法正确的是。（）A.HTMLCONTROLForms.HTML:Option.1允许站在潮湿的地面上触动带电物体或用潮湿抹布擦拭有电的电器。B.HTMLCONTROLForms.HTML:Option.1用完仪器设备后用手拉导线拨出电源插头。C.HTMLCONTROLForms.HTML:Option.1检修电路时可以不断开电源。D.HTMLCONTROLForms.HTML:Option.1万一发生触电事故，应迅速切断电源，采取必要的急救措施。D80.串联电路的特点是。（）A.HTMLCONTROLForms.HTML:Option.1总电阻等于各个电阻的电导之和。B.HTMLCONTROLForms.HTML:Option.1各电阻的电压为同一电压。C.HTMLCONTROLForms.HTML:Option.1总电流等于各并联元件电流之代数和。D.HTMLCONTROLForms.HTML:Option.1总电压等于各串联元件电压代数和。D81.电荷的定向运动形成电流，电流的单位是。（）A.HTMLCONTROLForms.HTML:Option.1AB.HTMLCONTROLForms.HTML:Option.1VC.HTMLCONTROLForms.HTML:Option.1ΩD.HTMLCONTROLForms.HTML:Option.1FA82.一只“100Ω，100W”的电阻与120V电源相串联，至少要串联Ω的电阻才能使该电阻正常工作。（）A.HTMLCONTROLForms.HTML:Option.120B.HTMLCONTROLForms.HTML:Option.130C.HTMLCONTROLForms.HTML:Option.140D.HTMLCONTROLForms.HTML:Option.150A83.一个实际电压源“100V，20Ω”，压流源等效互换后，电流源电流大小为A。（）A.HTMLCONTROLForms.HTML:Option.15B.HTMLCONTROLForms.HTML:Option.13C.HTMLCONTROLForms.HTML:Option.12D.HTMLCONTROLForms.HTML:Option.11A84.若电路中某两点之间的电阻等于零，则这两点就。（）A.HTMLCONTROLForms.HTML:Option.1短路B.HTMLCONTROLForms.HTML:Option.1开路C.HTMLCONTROLForms.HTML:Option.1断路D.HTMLCONTROLForms.HTML:Option.1通路A85.若电路中某两点之间的电阻为无穷大，则这两点就。（）A.HTMLCONTROLForms.HTML:Option.1开路B.HTMLCONTROLForms.HTML:Option.1短路C.HTMLCONTROLForms.HTML:Option.1断路D.HTMLCONTROLForms.HTML:Option.1通路A86.有m条支路，n个节点的电路，应用支路电流法可列出m个独立方程，其中节点电流方程为个。（）A.HTMLCONTROLForms.HTML:Option.1n+1B.HTMLCONTROLForms.HTML:Option.1n-1C.HTMLCONTROLForms.HTML:Option.1m-1D.HTMLCONTROLForms.HTML:Option.1m-n+1B87.有m条支路，n个节点的电路，应用支路电流法可列出m个独立方程，其中回路电压方程为个。（）A.HTMLCONTROLForms.HTML:Option.1n-1B.HTMLCONTROLForms.HTML:Option.1m-n+1C.HTMLCONTROLForms.HTML:Option.1m-1D.HTMLCONTROLForms.HTML:Option.1m-n-1B88.图23所示电路的等值理想电源参数为U=V。（）A.HTMLCONTROLForms.HTML:Option.15B.HTMLCONTROLForms.HTML:Option.14C.HTMLCONTROLForms.HTML:Option.16D.HTMLCONTROLForms.HTML:Option.18B89.图24所示电路的等值理想电源参数为I=A。（）A.HTMLCONTROLForms.HTML:Option.11B.HTMLCONTROLForms.HTML:Option.12C.HTMLCONTROLForms.HTML:Option.13D.HTMLCONTROLForms.HTML:Option.14B90.一般金属导体具有正温度系数，当环境温度升高时，电阻值将。（）A.HTMLCONTROLForms.HTML:Option.1减小B.HTMLCONTROLForms.HTML:Option.1增大C.HTMLCONTROLForms.HTML:Option.1不变D.HTMLCONTROLForms.HTML:Option.1不确定B91.一条粗细均匀的导线，其电阻为48Ω，我们先把它切成n段，再把n段并联起来，电阻为3Ω，那么n等于。（）A.HTMLCONTROLForms.HTML:Option.12B.HTMLCONTROLForms.HTML:Option.13C.HTMLCONTROLForms.HTML:Option.14D.HTMLCONTROLForms.HTML:Option.15C92.在图25中，电路有个节点。（）A.HTMLCONTROLForms.HTML:Option.11B.HTMLCONTROLForms.HTML:Option.12C.HTMLCONTROLForms.HTML:Option.13D.HTMLCONTROLForms.HTML:Option.14C93.在图25中，电路有条支路。（）A.HTMLCONTROLForms.HTML:Option.13B.HTMLCONTROLForms.HTML:Option.14C.HTMLCONTROLForms.HTML:Option.15D.HTMLCONTROLForms.HTML:Option.16C94.在图25中，电路有个回路。（）A.HTMLCONTROLForms.HTML:Option.15B.HTMLCONTROLForms.HTML:Option.16C.HTMLCONTROLForms.HTML:Option.17D.HTMLCONTROLForms.HTML:Option.18C95.在图25中，电路有个网孔。（）A.HTMLCONTROLForms.HTML:Option.11B.HTMLCONTROLForms.HTML:Option.12C.HTMLCONTROLForms.HTML:Option.13D.HTMLCONTROLForms.HTML:Option.14C96.从商店买来的小电珠，将它接在电源上，发现只是灯丝被烧红，但不能正常发光，产生这种现象的原因是。（）A.HTMLCONTROLForms.HTML:Option.1电路没有接通B.HTMLCONTROLForms.HTML:Option.1小电珠的额定功率本来就小C.HTMLCONTROLForms.HTML:Option.1小电珠是坏的D.HTMLCONTROLForms.HTML:Option.1电源电压小于电珠的额定电压D97.“12V，6W”的灯泡接入6V的电路中，通过灯丝的实际电流是A。（）A.HTMLCONTROLForms.HTML:Option.12B.HTMLCONTROLForms.HTML:Option.11C.HTMLCONTROLForms.HTML:Option.10.5D.HTMLCONTROLForms.HTML:Option.10.25D98.一只小鸟停留在高压输电线路上，不会触电致死，是因为。（）A.HTMLCONTROLForms.HTML:Option.1小鸟的电阻非常大B.HTMLCONTROLForms.HTML:Option.1小鸟的身体绝对没有电流流过C.HTMLCONTROLForms.HTML:Option.1小鸟的脚是绝缘的D.HTMLCONTROLForms.HTML:Option.1小鸟两脚间电压很小D99.电路中两节点间的电压高，说明。（）A.HTMLCONTROLForms.HTML:Option.1这两个节点的电位都高B.HTMLCONTROLForms.HTML:Option.1这两个节点的电位一定大于零C.HTMLCONTROLForms.HTML:Option.1这两个节点的电位都低D.HTMLCONTROLForms.HTML:Option.1这两个节点的电位差大D100.电源的开路电压为220V，短路电流为10A，则负载能从电源获得最大功率是。（）A.HTMLCONTROLForms.HTML:Option.1200WB.HTMLCONTROLForms.HTML:Option.1220WC.HTMLCONTROLForms.HTML:Option.1500WD.HTMLCONTROLForms.HTML:Option.1550WD101.两个电阻并联，其中R1为200Ω，通过R1的电流I1为0.2A，通过整个并联电路的电流I为1A，则R2=Ω。（）A.HTMLCONTROLForms.HTML:Option.150B.HTMLCONTROLForms.HTML:Option.140C.HTMLCONTROLForms.HTML:Option.130D.HTMLCONTROLForms.HTML:Option.120A102.如图26所示，等效电阻Rab为Ω。（）A.HTMLCONTROLForms.HTML:Option.14B.HTMLCONTROLForms.HTML:Option.18C.HTMLCONTROLForms.HTML:Option.116D.HTMLCONTROLForms.HTML:Option.132A103.如图27所示，等效电阻Rab为Ω。（）A.HTMLCONTROLForms.HTML:Option.12B.HTMLCONTROLForms.HTML:Option.14C.HTMLCONTROLForms.HTML:Option.18D.HTMLCONTROLForms.HTML:Option.116A104.如图28所示，电流I1为A。（）A.HTMLCONTROLForms.HTML:Option.10.5B.HTMLCONTROLForms.HTML:Option.1-1C.HTMLCONTROLForms.HTML:Option.11.5D.HTMLCONTROLForms.HTML:Option.12A105.如图29所示，等效电路为。（）A.HTMLCONTROLForms.HTML:Option.1AB.HTMLCONTROLForms.HTML:Option.1BC.HTMLCONTROLForms.HTML:Option.1CD.HTMLCONTROLForms.HTML:Option.1DA106.如图30所示电路，网孔电流方程式正确的是。（）A.HTMLCONTROLForms.HTML:Option.1AB.HTMLCONTROLForms.HTML:Option.1BC.HTMLCONTROLForms.HTML:Option.1CD.HTMLCONTROLForms.HTML:Option.1DB107.如图31所示电路，戴维南等效电路正确的是。（）A.HTMLCONTROLForms.HTML:Option.1AB.HTMLCONTROLForms.HTML:Option.1BC.HTMLCONTROLForms.HTML:Option.1CD.HTMLCONTROLForms.HTML:Option.1DB108.如图33所示电路，当RL为2Ω时，负载可获得最大的功率，此时R2=Ω。（）A.HTMLCONTROLForms.HTML:Option.10.5B.HTMLCONTROLForms.HTML:Option.11C.HTMLCONTROLForms.HTML:Option.12D.HTMLCONTROLForms.HTML:Option.14B109.基尔霍夫定律包括个定律。（）A.HTMLCONTROLForms.HTML:Option.11B.HTMLCONTROLForms.HTML:Option.12C.HTMLCONTROLForms.HTML:Option.13D.HTMLCONTROLForms.HTML:Option.14B110.支路电流法是以为求解对象。（）A.HTMLCONTROLForms.HTML:Option.1节点电压B.HTMLCONTROLForms.HTML:Option.1支路电流C.HTMLCONTROLForms.HTML:Option.1电路功率D.HTMLCONTROLForms.HTML:Option.1网孔电流B111.用一个电动势和内阻串联表示的电源称为。（）A.HTMLCONTROLForms.HTML:Option.1受控电流源B.HTMLCONTROLForms.HTML:Option.1电流源C.HTMLCONTROLForms.HTML:Option.1电压源D.HTMLCONTROLForms.HTML:Option.1受控电压源C112.如图32所示电路，戴维南等效电路正确的是。（）A.HTMLCONTROLForms.HTML:Option.1AB.HTMLCONTROLForms.HTML:Option.1BC.HTMLCONTROLForms.HTML:Option.1CD.HTMLCONTROLForms.HTML:Option.1DC113.如图34所示，等效电路为。（）A.HTMLCONTROLForms.HTML:Option.1AB.HTMLCONTROLForms.HTML:Option.1BC.HTMLCONTROLForms.HTML:Option.1CD.HTMLCONTROLForms.HTML:Option.1DC114.一个电激流和内阻并联表示的电源称为。（）A.HTMLCONTROLForms.HTML:Option.1受控电压源B.HTMLCONTROLForms.HTML:Option.1电压源C.HTMLCONTROLForms.HTML:Option.1电流源D.HTMLCONTROLForms.HTML:Option.1受控电流源C115.戴维南定理适用于。（）A.HTMLCONTROLForms.HTML:Option.1任意二端网络B.HTMLCONTROLForms.HTML:Option.1线性二端网络C.HTMLCONTROLForms.HTML:Option.1有源线性二端网络D.HTMLCONTROLForms.HTML:Option.1非线性二端网络C116.如图31所示电路，戴维南等效电路正确的是。（）A.HTMLCONTROLForms.HTML:Option.1AB.HTMLCONTROLForms.HTML:Option.1BC.HTMLCONTROLForms.HTML:Option.1CD.HTMLCONTROLForms.HTML:Option.1DD117.如图35所示，叠加图正确的是。（）A.HTMLCONTROLForms.HTML:Option.1AB.HTMLCONTROLForms.HTML:Option.1BC.HTMLCONTROLForms.HTML:Option.1CD.HTMLCONTROLForms.HTML:Option.1DD118.电位是指电路中某点与之间的电压。（）A.HTMLCONTROLForms.HTML:Option.1任意点B.HTMLCONTROLForms.HTML:Option.1节点C.HTMLCONTROLForms.HTML:Option.1地D.HTMLCONTROLForms.HTML:Option.1参考点D119.欧姆定律适合于。（）A.HTMLCONTROLForms.HTML:Option.1时变电路B.HTMLCONTROLForms.HTML:Option.1任何电路C.HTMLCONTROLForms.HTML:Option.1非线性电路D.HTMLCONTROLForms.HTML:Option.1线性电路D120.戴维南定理适合于求条支路电流。（）A.HTMLCONTROLForms.HTML:Option.14B.HTMLCONTROLForms.HTML:Option.13C.HTMLCONTROLForms.HTML:Option.12D.HTMLCONTROLForms.HTML:Option.11D121.两跟同种材料的电阻丝，长度之比为1：5，横截面积之比为2：3，则它们电阻之比为（）A.HTMLCONTROLForms.HTML:Option.14：10B.HTMLCONTROLForms.HTML:Option.13：10C.HTMLCONTROLForms.HTML:Option.11：3D.HTMLCONTROLForms.HTML:Option.12：7B122.有一盏220V，60W的电灯，接在220V的电源上，则通过电灯电阻的电流为（）A.HTMLCONTROLForms.HTML:Option.11AB.HTMLCONTROLForms.HTML:Option.12AC.HTMLCONTROLForms.HTML:Option.10.5AD.HTMLCONTROLForms.HTML:Option.10.27AD123.若灯泡电阻为484Ω，通过灯泡的电流为0.45A，则灯泡两小时内电流所做的功为（）A.HTMLCONTROLForms.HTML:Option.1705672JB.HTMLCONTROLForms.HTML:Option.1205672JC.HTMLCONTROLForms.HTML:Option.1305672JD.HTMLCONTROLForms.HTML:Option.1405672JA124.某导体的电阻是1Ω，通过它的电流是1A，那么在1min内通过导体横截面的电荷量是（）A.HTMLCONTROLForms.HTML:Option.150CB.HTMLCONTROLForms.HTML:Option.160CC.HTMLCONTROLForms.HTML:Option.170CD.HTMLCONTROLForms.HTML:Option.180CB125.某导体的电阻是1Ω，通过它的电流是1A，那么在1min内电流做的功是（）A.HTMLCONTROLForms.HTML:Option.130JB.HTMLCONTROLForms.HTML:Option.140JC.HTMLCONTROLForms.HTML:Option.150JD.HTMLCONTROLForms.HTML:Option.160JD126.某导体的电阻是1Ω，通过它的电流是1A，那么在1min内消耗的功率是（）A.HTMLCONTROLForms.HTML:Option.13WB.HTMLCONTROLForms.HTML:Option.14WC.HTMLCONTROLForms.HTML:Option.11WD.HTMLCONTROLForms.HTML:Option.15WC127.电能的转换速率，即电能对时间的变化率，叫做（）A.HTMLCONTROLForms.HTML:Option.1电功率B.HTMLCONTROLForms.HTML:Option.1电能C.HTMLCONTROLForms.HTML:Option.1电压D.HTMLCONTROLForms.HTML:Option.1电流A128.标有220V，100W的灯泡，经过一段导线接在220V的电源上，它的实际功率为81W，则导线上损耗的功率是（）A.HTMLCONTROLForms.HTML:Option.13WB.HTMLCONTROLForms.HTML:Option.14WC.HTMLCONTROLForms.HTML:Option.19WD.HTMLCONTROLForms.HTML:Option.15WC129.R1和R2并联，其功率之比P1：P2=1：2，并联的等效电阻为2Ω，则R1=（）A.HTMLCONTROLForms.HTML:Option.16ΩB.HTMLCONTROLForms.HTML:Option.17ΩC.HTMLCONTROLForms.HTML:Option.18ΩD.HTMLCONTROLForms.HTML:Option.19ΩA130.电压和电流的参考方向一致，称为方向。A.HTMLCONTROLForms.HTML:Option.1关联参考考B.HTMLCONTROLForms.HTML:Option.1非关联参考C.HTMLCONTROLForms.HTML:Option.1参考D.HTMLCONTROLForms.HTML:Option.1正方向A131.电压和电流的参考方向相反，称为方向。A.HTMLCONTROLForms.HTML:Option.1关联参考B.HTMLCONTROLForms.HTML:Option.1非关联参考C.HTMLCONTROLForms.HTML:Option.1参考D.HTMLCONTROLForms.HTML:Option.1正方向B132.电压和电流的负值，表明参考方向与实际方向（）A.HTMLCONTROLForms.HTML:Option.1一致B.HTMLCONTROLForms.HTML:Option.1不一致C.HTMLCONTROLForms.HTML:Option.1相反D.HTMLCONTROLForms.HTML:Option.1无关A133.端电压恒为u，与流过它的电流i无关的二端元件称为（）A.HTMLCONTROLForms.HTML:Option.1电压源B.HTMLCONTROLForms.HTML:Option.1电流源C.HTMLCONTROLForms.HTML:Option.1独立源D.HTMLCONTROLForms.HTML:Option.1受控源A134.输出电流恒为i，与其端电压u无关的二端元件称为（）A.HTMLCONTROLForms.HTML:Option.1电压源B.HTMLCONTROLForms.HTML:Option.1电流源C.HTMLCONTROLForms.HTML:Option.1独立源D.HTMLCONTROLForms.HTML:Option.1受控源B135.平面图的回路内再无任何支路的闭合回路称为（）A.HTMLCONTROLForms.HTML:Option.1节点B.HTMLCONTROLForms.HTML:Option.1支路C.HTMLCONTROLForms.HTML:Option.1回路D.HTMLCONTROLForms.HTML:Option.1网孔D136.当电路中电流的参考方向与电流的真实方向相反时，该电流（）A.HTMLCONTROLForms.HTML:Option.1一定为正值B.HTMLCONTROLForms.HTML:Option.1一定为负值C.HTMLCONTROLForms.HTML:Option.1不能肯定是正值或负值D.HTMLCONTROLForms.HTML:Option.1以上都对B137.已知空间有a、b两点，电压Uab=10V，a点电位为Va=4V，则b点电位Vb为（）A.HTMLCONTROLForms.HTML:Option.16VB.HTMLCONTROLForms.HTML:Option.1－6VC.HTMLCONTROLForms.HTML:Option.114VD.HTMLCONTROLForms.HTML:Option.112vB138.当电阻R上的、参考方向为非关联时，欧姆定律的表达式应为（）A.HTMLCONTROLForms.HTML:Option.1u=RiB.HTMLCONTROLForms.HTML:Option.1u=-RiC.HTMLCONTROLForms.HTML:Option.1u=R|i|D.HTMLCONTROLForms.HTML:Option.1u=R/iB139.一电阻R上u、i参考方向不一致，令u=－10V，消耗功率为0.5W，则电阻R为（）A.HTMLCONTROLForms.HTML:Option.1200ΩB.HTMLCONTROLForms.HTML:Option.1－200ΩC.HTMLCONTROLForms.HTML:Option.1±200ΩD.HTMLCONTROLForms.HTML:Option.10A140.两个电阻串联，R1：R2=1：2，总电压为60V，则U1的大小为（）A.HTMLCONTROLForms.HTML:Option.110VB.HTMLCONTROLForms.HTML:Option.120VC.HTMLCONTROLForms.HTML:Option.130VD.HTMLCONTROLForms.HTML:Option.140VB141.戴维南定理说明一个线性有源二端网络可等效为和内阻的串联来表示。A.HTMLCONTROLForms.HTML:Option.1短路电流IscB.HTMLCONTROLForms.HTML:Option.1开路电压UocC.HTMLCONTROLForms.HTML:Option.1无D.HTMLCONTROLForms.HTML:Option.1无B142.自动满足基尔霍夫第一定律的电路求解法是（）A.HTMLCONTROLForms.HTML:Option.1支路电流法B.HTMLCONTROLForms.HTML:Option.1回路电流法C.HTMLCONTROLF