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如图所示的电路中,当开关K闭合时,灯泡L正常发光,现断开开关K,闭合电路的总电阻将 (填“增大”“减小”或“不变”),灯泡L的亮度将 (填“变亮”“变暗”或“不变”)
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高三上学期物理《》真题及答案
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如图所示闭合开关S.后调节滑动变阻器R.和Rt使同样规格的两个小灯泡
和
都正常发光,然后断开开关。下列说法正确的是( ▲ ) A.再次闭合开关S.时,灯泡A.和B.同时正常发光 B.再次闭合开关S.时,灯泡B.立刻正常发光,灯泡A.逐渐亮起来
再次闭合开关S.时,灯泡A.立刻正常发光,灯泡B.逐渐亮起来
闭合开关S.使灯泡A.B.正常发光后,再断开开关S.,灯泡B.立刻熄灭
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阻R1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2.
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
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
如图所示的电路中不计温度对灯丝电阻的影响电源电压保持不变当在ab间接6V6W的灯泡时闭合开关灯L.恰
灯将变亮
灯将变暗
换接的灯可能烧坏
电路总功率要变小
如图所示L.是标有6V1.2W.字样的小灯泡R.是定值电阻断开开关S2闭合开关S1和S3灯泡正常发光
如图所示的电路中不计温度对灯丝电阻的影响电源电压保持不变当在ab间接入6V6W的灯泡时闭合开关灯L.
灯L.将变亮
灯L.将变暗
换接的灯可能烧坏
电路总功率要变小
如图所示的装置中电源电压为6V小灯泡上标有6V3W字样轻质弹簧的上端固定且与导线连接良好当开关K.断
小灯泡正常发光
小灯泡不能发光
小灯泡忽明忽暗
以上三种情况都有可能
如图所示电源电压保持不变当滑动变阻器的滑片P.滑到
端时,闭合开关S
1
和S
2
,灯泡L.恰好正常发光,以下说法正确的是( ) A.滑片P.仍在A.端,开关S
1
断开,S
2
闭合,灯泡L.仍正常发光
滑片P.仍在A.端,开关S
1
闭合,S
2
断开,灯泡L.仍正常发光
滑片P.滑到B.端,同时闭合开关S
1
和S
2
,灯泡L.仍正常发光
滑片P.滑到B.端,开关S
1
闭合,S
2
断开,灯泡L.仍正常发光
如图所示的电路中不计温度对灯丝电阻的影响电源电压保持不变当在ab间接6V6W的灯泡时闭合开关灯L.恰
灯L.的实际功率变小
灯L.的实际功率变大
换接的灯可能烧坏
电路总功率要变小
如图所示的电路闭合开关小灯泡发光断开开关将小灯泡和电流表位置互换后重新闭合开关则
小灯泡不能发光
电压表和电流表示数都变为零
小灯仍能发光
电压表示数变大,电流表会被烧坏
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.电阻R.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3A此
如图所示电源电压不变在ab间接入3V2W的灯泡时闭合开关灯泡L.恰能正常发光断开开关在ab间换接一个
ab间电压不变
电路中的电流变大
灯L.将变暗
电路中的总功率减小
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
如图所示电源电压保持不变当变阻器滑片P.滑到
端时,闭合开关S
1
和S
2
,灯泡L.恰好正常发光,以下说法正确的是( )
A.滑片P.仍在A.端,开关S1断开,S2闭合,灯泡L.仍正常发光
滑片P.仍在A.端,开关S1闭合,S2断开,灯泡L.仍正常发光
滑片P.滑到B.端,同时闭合开关S1和S2,灯泡L.仍正常发光
滑片P.滑到B.端,开关S1闭合,S2断开,灯泡L.仍正常发光
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
如图所示的电路中当开关闭合时L.1L.2并联当开关闭合时电路会发生短路损坏电路当开关闭合时灯泡都发光
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
/
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