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如图所示电路,当开关S断开,两灯泡都能正常工作,则甲为 表(选填“电压表”或“电流表”),两灯的连接方式是
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如图所示
B.是完全相同的两个小灯泡,L.为自感系数很大的线圈,其直流电阻小于灯泡电阻.闭合开关S.,电路稳定时,
灯恰能正常发光,则( ) A.开关S.闭合的瞬间,A.比B.先发光,随后B.灯变亮 B.闭合开关S.,电路稳定时,A.灯熄灭
断开开关S.的瞬间,A.灯灯丝不可能被烧断
断开开关S.的瞬间,B.灯立即熄灭
如题14图甲所示是标有2.5V.字样的小灯泡L.的电阻值随它两端电压变化的图像.将小灯泡L.和电阻R
如图所示的电路中电阻R.1为5Ω.当开关S.断开时电流表的示数为2A.当开关S.闭合时电流表的示数为
在如图所示的电路中ab为两个完全相同的灯泡L.为自感线圈E.为电源S.为开关关于两灯泡点亮和熄灭的先
合上开关,a先亮,b后亮;断开开关,a、b同时熄灭
合上开关,b先亮,a后亮;断开开关,a先熄灭,b后熄灭
合上开关,b先亮,a后亮;断开开关,a、b同时熄灭
合上开关,a、b同时亮;断开开关,b熄灭,a后熄灭
如图所示线圈的自感系数较大开关闭合电路稳定后灯泡正常发光则下列说法正确的是
开关S.闭合,电路稳定后,现突然断开开关S.时,灯泡立即熄灭
开关S.闭合,电路稳定后,现突然断开开关S.时,灯泡慢慢熄灭
开关S.原先断开状态,现突然闭合开关S.时,灯泡立即变亮
开关S.原先断开状态,现突然闭合开关S.时,灯泡慢慢变亮
在如图所示的电路中不论开关如何切换电铃和灯泡都能安全使用.若想让灯泡和电铃同时工作需要闭合开关若同时
如图所示的电路中要使灯泡L.1和灯泡L.2组成串联电路应将开关S.1断开开关S.2闭合开关S.3要使
如图甲所示是标有2.5V字样的小灯泡L.的电阻随它两端电压变化的图象将小灯泡L.和电阻R.接入图乙所
在如图所示的电路中ab为两个完全相同的灯泡L.为自感线圈E.为电源S.为开关关于两灯泡点亮和熄灭的先
合上开关,a先亮,b后亮;断开开关,a、b同时熄灭
合上开关,b先亮,a后亮;断开开关,a、b同时熄灭
合上开关,b先亮,a后亮;断开开关,a先熄灭,b后熄灭
合上开关,a、b同时亮;断开开关,b先熄灭,a后熄灭
如图所示电路已知电源电压U=6V灯泡L.1上标有2V4W字样当开关S.闭合时灯泡L.2正常发光当开关
如图所示的电路中电源电压恒为6V.1当开关S1闭合S2S3断开时电流表示数为0.3A求R.的阻值2闭
电源e开关s定值电阻r小灯泡a和带铁芯的线圈l其电阻可忽略连成如图所示的电路闭合开关s电路稳定时小灯
小灯泡a立即熄灭
小灯泡a逐渐变暗,且电流方向与断开s前相同
小灯泡a逐渐变暗,且电流方向与断开s前相反
小灯泡a先变得比断开s前更亮,然后逐渐变暗
在如图所示的电路中ab为两个完全相同的灯泡L.为自感线圈E.为电源S.为开关关于两灯泡点亮和熄灭的先
合上开关,a先亮,b后亮;断开开关,a、b同时熄灭
合上开关,b先亮,a后亮;断开开关,a先熄灭,b后熄灭
合上开关,b先亮,a后亮;断开开关,a、b同时熄灭
合上开关,a、b同时亮;断开开关,b熄灭,a后熄灭
在如图所示的电路中ab为两个完全相同的灯泡L.为自感线圈E.为电源S.为开关.关于两灯泡点亮和熄灭的
合上开关,a先亮,b逐渐变亮;断开开关,a、b同时熄灭
合上开关,b先亮,a逐渐变亮;断开开关,a先熄灭,b后熄灭
合上开关,b先亮,a逐渐变亮;断开开关,a、b同时熄灭
合上开关,a、b同时亮;断开开关,b先熄灭,a后熄灭
如图13甲所示是标有2.5V字样的小灯泡L.的电阻随它两端电压变化的图象将小灯泡L.和电阻R.接入图
如图所示Al和
2是两个规格完全相同的灯泡,Al与自感线圈L.串联后接到电路中,A.2与可变电阻串联后接到电路中。先闭合开关S.,缓慢调节电阻R.,使两个灯泡的亮度相同,再调节电阻R1,使两个灯泡都正常发光,然后断开开关S.。对于这个电路,下列说法中正确的是( ) A.再闭合开关S.时,A.2先亮,Al后亮
再闭合开关S.时,Al 和A.2同时亮
再闭合开关S.,待电路稳定后,重新断开开关S.,A.2立刻熄灭,A.1过一会儿熄灭
再闭合开关S.,待电路稳定后,重新断开开关S.,Al 和A.2都要过一会儿才熄灭
如图所示
B.是完全相同的两个小灯泡,L.为自感系数很大的线圈,其直流电阻小于灯泡电阻.闭合开关S.,电路稳定时,
灯恰能正常发光,则( )A.开关S.闭合的瞬间,A.比B.先发光,随后B.灯变亮B.闭合开关S.,电路稳定时,A.灯熄灭
断开开关S.的瞬间,A.灯灯丝不可能被烧断
断开开关S.的瞬间,B.灯立即熄灭
如图所示的电路中电源电压恒为6V1当开关S1闭合S2S3断开时电流表示数为0.3A.求R.的阻值2闭
如图所示
B.是完全相同的两个小灯泡,L.为自感系数很大的线圈,其直流电阻小于灯泡电阻.闭合开关S.,电路稳定时,
灯恰能正常发光,则 A.开关S.闭合的瞬间,A.比B.先发光,随后B.灯变亮B.闭合开关S.,电路稳定时,A.灯熄灭
断开开关S.的瞬间,A.灯灯丝不可能被烧断
断开开关S.的瞬间,B.灯立即熄灭
/
如图5所示的甲乙两个电路电感线圈的自感系数足够大且直流电阻不可忽略闭合开关S.待电路达到稳定后灯泡均
甲电路中灯泡将渐渐变暗
甲电路中灯泡将先变得更亮,然后渐渐变暗
乙电路中灯泡将渐渐变暗
乙电路中灯泡将先变得更亮,然后渐渐变暗
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