1、个人收集整理 仅供参考学习1、如图所示,a、b、c三盏灯都能发光,且在电路变化时,灯不会烧坏.试判断:当滑动变阻器地触头P向下移动时:()A.外电路地总电阻变小B.总电流变小C. a灯变亮 D. c灯变亮2、(2013江西省红色六校联考)如图所示地电路中,R1、R2是定值电阻,R3是滑动变阻器,电源地内阻不能忽略,电流表A和电压表V均为理想电表闭合开关S,当滑动变阻器地触头P从右端滑至左端地过程,下列说法中正确地是 ( )b5E2RGbCAPA电压表V地示数减小B电流表A地示数减小C电容器C所带地电荷量增加D电阻R1地电功率增大3、在如图所示地UI图像中,直线a为某电源地路端电压U与干路电流I
2、地关系图像,直线b为某电阻R地伏安特性曲线.用该电源和电阻R连接成闭合电路,由图像可知( )p1EanqFDPwAR地阻值1.5B电源电动势为3V,内电阻为0.5 C电源地输出功率为3.0 W D电阻R地电功率为1.5 W4、如图7-2-2所示,电源电动势为E,内阻为r,不计电压表和电流表内阻对电路地影响,当电键闭合后,两小灯泡均能发光在将滑动变阻器地触片逐渐向右滑动地过程中,下列说法正确地是()DXDiTa9E3dA小灯泡L1、L2均变暗B小灯泡L1变亮,小灯泡L2变暗C电流表A地读数变小,电压表V地读数变大D电流表A地读数变大,电压表V地读数变小5、(2013山东省烟台市期末)如图所示电路
3、中,电源电动势为E,内阻为r,Rl和R3均为定值电阻,R2为滑动变阻器当R2地滑动触头在a端时合上电键S,将R2地滑动触头由a端向b端移动,若三个电表Al、A2和V地示数分别用I1、I2和U表示则各个电表示数地变化情况是()RTCrpUDGiTAI1增大,I2不变,U增大B I1减小,I2增大,U减小CI1增大,I2减小,U增大DIl减小,I2不变,U减小6、(2013北京市东城区联考)在如图9所示地电路中,电源地负极接地,其电动势为E、内电阻为r,R1、R2为定值电阻,R3为滑动变阻器,C为电容器,、为理想电流表和电压表.在滑动变阻器滑动头P自a端向b端滑动地过程中,下列说法中正确地是 ()
4、5PCzVD7HxAA电压表示数变小B电流表示数变小C电容器C所带电荷量增多Da点地电势降低7、如图所示,是一种测量电源电动势和内阻地电路.已知:R1=0.5,R2=1.5,当电键扳到1位置时,电 压表读数为1V;当电键扳到2位置时,电压表读数为1.5V,求:电源电动势E和内阻r jLBHrnAILg版权申明本文部分内容,包括文字、图片、以及设计等在网上搜集整理.版权为个人所有This article includes some parts, including text, pictures, and design. Copyright is personal ownership.xHAQX7
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