在如图所示的电路中当开关s断开时下列说法中正确的是 A．电源两端电压为零 b．电灯两端电压为零 c．开关两端电压为零 d．以上说法都不 Sketch Coloring Page

在如图所示的电路中当开关s断开时下列说法中正确的是 A．电源两端电压为零 b．电灯两端电压为零 c．开关两端电压为零 d．以上说法都不 Template

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tomski在如图所示的电路中当开关s断开时下列说法中正确的是 a．电源两端电压为零 b．电灯两端电压为零 coloring

如图2所示的电路中电源电压不变开关闭合后若�动变阻器的�片P�右端移动则 A电压表的示数和电流表的示数都增大 B电压表的示数和电流 sketch template

在如图所示的电路中当开关S闭合后电压表示数为6V当开关S断开时电压表示数为4V则此时灯L1和L2两端的电压分别为 A．6V sketch template

如图所示的电路中，电源电压保持不变。闭合开关S后，�片P从b端移动到a端的过程，电压表示数U与电流表示数I的关系图像如图所示。下列说法正确的是（ sketch template

题目如图所示的电路中S1闭合S2断开时甲乙是电流表Ⅰ甲I乙=13此电路通电一分钟所产生的热量为Q1当S1S2都闭合时甲 sketch template

如图2所示电路，当开关S闭合后，L1、L2均能�光，电流表、电压表均有示数．过一会儿，两灯都不�光．电流表、电压表的示数均为零，可能�生的故障 sketch template

如图所示，电源电压恒为18V，定值电阻R1=20Ω，�动变阻器R2标有“40Ω 05A”，电流表A的量程为006A，电压表量程为0 sketch template

如图所示的电路中电源的电压保持不变R1为定值电阻R2为�动变阻器闭合开关S�片P�右移动时则A．电流表A的示数变大B．电压表V的示 sketch template

在如图所示的电路中当开关S1S2都闭合后则 A．L1L2两灯串联B．L1L2两灯并联C．灯L1被短路D．灯L2被短路题目和 sketch template

在如图所示的电路中开关S闭合时电灯L1和L2是并联的断开开关S电流表的示数不变选填“变大 “变小或“不变 电压表的示数不变 sketch template

在如图所示的电路中当�动变阻器R的�动片P�下移动时以下判断中正确的是 A电源内部�热功率变小 B小电珠L变亮 C电流表上读数 sketch template

题目如右图所示家庭电路中当开关S闭合后灯泡L不亮用试电笔测试cd两点时氖管都�光测试ab两点时只有a点氖管�光则故障可能 sketch template

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在图所示的电路中电源电压保持不变当开关S1闭合S2断开甲乙为电流表时两表示数之比是I甲I乙=25．则R1R2= 当开关S1 sketch template

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20．在如图所示电路中闭合电键S当�动变阻器的�动触头P�下�动时四个理想电表的示数都�生变化电表的示数分别用IU1U2和U3表示 sketch template

如图所示电路电源两端电压一定．当开关S断开�动变阻器接入电路的电阻为Ra时通过电阻Ra的电流为I1电阻R1和电阻R2消耗的功率之和P1 sketch template

在如图所示的电路中当S1闭合S2S3断开时电压表的示数为6V当S1S3断开S2闭合时电压表的示数为3V．求 1电源电压是 sketch template

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如图所示的电路中当开关S闭合甲乙两表是电压表时示数之比U甲U乙=32当开关S断开甲乙两表是电流表时则两表的示数之比I甲I sketch template

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在如图所示的电路中电源电压保持不变闭合开关S当�动变阻器的�片P�右移动时下列说法正确的是 A．电压表V示数与电流表A1示数的乘积 sketch template

如图所示的电路中要使灯泡L1和灯泡L2组成串联电路应将开关S1断开开关S2闭合开关S3 要使灯泡L1和灯泡L2组成并联电路应将开关 sketch template

百度教育 sketch template

如图所示的电路中电源电压保持不变．当�动变阻器的�片P�右�动时 电流表和电压表的示数变化情况是 A．电流表和电压表的示数都变大 sketch template

如图所示的电路中电源电压不变闭合开关S当�动变阻器的�片P从A�B�动时下列说法正确的是 A．电压表V1的示数变大B．电压表V2的 sketch template

如图所示的电路中电源两端的电压保持不变闭合开关SS1当�片P 移至�动变阻器R2的A端时电压表V1的示数为U1电压表V2的示数为 sketch template

12．在如图所示的电路中电源电压恒定为U电键闭合后将�动变阻器R2的�片P�左�动时电路中的小灯泡L1L 2和L 3的亮度变化情况是 sketch template

如图所示的电路中若要使灯L1和L2组成并联电路应闭合开关 应断开开关 A．S2S3S1B．S1S3S2C．S1S2S3——青 sketch template

如图所示的电路中电源两端电压保持不变R1=10ΩR1＜R2R3的变化范围是0 20Ω．当�动变阻器的�片P在a端时电流表的示数为0 sketch template

13．如图4所示电源电压和灯泡电阻都保持不变当�动变阻器的�片P由中点�右移动时下列判断不正确的是 A．电流表和电压表的示数都增大 B sketch template

在如图所示的电路中电源电压不变．开关S闭合后移动�片P改变�动变阻器接入电路的阻值使电压表的示数从6V变化到2V同时观察到电流表的示 sketch template

在如图所示的电路中当开关S1闭合S2断开时电压表的示数为25V当开关S1断开S2闭合时电压表的示数为6V则灯泡L2两端的电压为A sketch template

如图所示的电路中闭合开关S后比较abcd四处电流大小其中不正确的是 A．Ia＞IbB．Ia=IdC．Ia＞IdD．Id＞Ic sketch template

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