多选题 适中0.65 引用1 组卷220
如图所示电路中,A、B两灯均正常发光,R为一滑动变阻器,P为滑动片,若将滑动片向下滑动,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/63795ef5-5691-4d35-8a2b-f987812ad163.png?resizew=202)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/63795ef5-5691-4d35-8a2b-f987812ad163.png?resizew=202)
A.A灯变暗 |
B.B灯变亮 |
C.总电流变小 |
D.R1上消耗功率变大 |
16-17高二·黑龙江齐齐哈尔·期中
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如图所示的电路中,a、b、c三只小灯泡均发光,当把滑动变阻器R的滑动片P向下滑动时,三只灯泡的明暗变化是( )
![](https://img.xkw.com/dksih/QBM/2016/7/11/1575897766191104/1575897766363136/STEM/5cb94535095245b9bc49d96c97c1cdbb.png)
![](https://img.xkw.com/dksih/QBM/2016/7/11/1575897766191104/1575897766363136/STEM/5cb94535095245b9bc49d96c97c1cdbb.png)
A.a、b灯都变暗,c灯变亮 |
B.a、c灯都变暗,b灯变亮 |
C.a、b、c三灯都变亮 |
D.a、b、c三灯都变暗 |
如图所示,闭合电键S后,A灯与B灯均发光,电流表A1、A2的读数分别为I1、I2,当滑动变阻器滑动片向下滑动一段后,电流表A1、A2读数变化的大小分别为△I1、△I2,则下列说法中正确的是( )
![](https://img.xkw.com/dksih/QBM/2017/2/22/1630048848928768/1630048849084416/STEM/4efa1cb7-9563-4cd5-88cf-78ab27b7b54d.png?resizew=149)
![](https://img.xkw.com/dksih/QBM/2017/2/22/1630048848928768/1630048849084416/STEM/4efa1cb7-9563-4cd5-88cf-78ab27b7b54d.png?resizew=149)
A.A灯变暗 | B.B灯变亮 | C.I1、I2都变小 | D.△I1<△I2 |
如图所示电路,A1、A2、A3三只小灯泡均发光,电压U不变,当把变阻器R的滑动片P向下滑动时,三只灯泡的亮度变化情况是( )
![](https://img.xkw.com/dksih/QBM/2016/3/18/1575840659554304/1575840659734528/STEM/0f4feb89-4742-41fe-86e4-80d365c28439.png?resizew=154)
![](https://img.xkw.com/dksih/QBM/2016/3/18/1575840659554304/1575840659734528/STEM/0f4feb89-4742-41fe-86e4-80d365c28439.png?resizew=154)
A.A1、A2变暗,A3变亮 |
B.A1、A3变暗,A2变亮 |
C.A1、A2、A3灯都变暗 |
D.A1灯变暗,A2、A3灯变亮 |
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