(09恒定电流)10 闭合电路动态分析2-4 原卷
2、比值的增减判断与求解1、如图所示,电源电动势为E,内电阻为r,理想电压表V1、V2示数为U1、U2,其变化量的绝对值分别为△U1和△U2;流过电源的电流为I,其变化量的绝对值为△I。当滑动变阻器的触片从左端向右端滑动的过程中(不计灯泡电阻的变化)( )A.小灯泡L3变亮,L1、L2变暗B.电压表V1示数变小,电压表V2示数变大C.不变D.变大2、如图所示电路中,电源的电动势为E,内阻为r,各电阻阻值如图所示,当滑动变阻器的滑动触头P从a端滑到b端的过程中,下列说法正确的是( )A.电压表的读数U先减小,后增大B.电流表的读数I先增大,后减小C.电压表读数U与电流表读数I的比值不变D.电...
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