中学生网络课堂本课配套习题挑战模式1/5
单选题
难度系数：
1.
如图所示，闭合开关，灯泡正常发光，将滑动变阻器的滑片向上滑动时，观察到的现象是（ ）
| A: 灯泡变暗，电压表示数变大 |
| B: 灯泡变亮，电压表示数不变 |
| C: 灯泡变暗，电压表示数不变 |
| D: 灯泡变亮，电压表示数变大 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：PHA+55S15rWB5aKe5aSn77yM54Gv5rOh5Y+Y5Lqu77yM55S15rWB5Y+Y5bCP77yM54Gv5rOh5Y+Y5pqX44CCPGJyPjwvcD4=
- 答案：Qw==
PHA+77yIMe+8ieeUseeUtei3r+WbvuWPr+efpe+8jOeUteWOi+ihqOa1i+eUtea6kOeUteWOi++8jOeUtea6kOeUteWOi+S4jeWPmO+8jOWboOatpOa7keeJh+enu+WKqOaXtu+8jOeUteWOi+ihqOekuuaVsOS4jeWPmO+8mzwvcD48cD7vvIgy77yJ55Sx55S16Lev5Zu+5Y+v55+l77yM5ruR54mH5ZCR5LiK5ruR5Yiw5pe277yM5ruR5Yqo5Y+Y6Zi75Zmo5o6l5YWl55S16Lev6Zi75YC85Y+Y5aSn77yM5YiZ55S16Lev5Lit55qE55S15rWB5Y+Y5bCP77yM54Gv5rOh5Y+Y5pqX77ybPC9wPjxwPuaVhemAiUPvvI48L3A+
本课配套习题挑战模式2/5
单选题
难度系数：
2.
滑动变阻器改变电阻大小的方法是（ ）
| A: 改变导体的长度 |
| B: 改变导体材料 |
| C: 改变温度 |
| D: 改变导体横截面积 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5ruR5Yqo5Y+Y6Zi75Zmo55qE5Y6f55CG77ya5pS55Y+Y6L+e5YWl55S16Lev55qE55S16Zi75Lid55qE6ZW/5bqm77yM5pS55Y+Y6L+e5YWl55S16Lev55qE55S16Zi755qE5aSn5bCP77yM5LuO6ICM5pS55Y+Y55S16Lev5Lit55qE55S15rWBPGJyPjwvcD4=
- 答案：QQ==
PHA+5ruR5Yqo5Y+Y6Zi75Zmo55qE55S16Zi75Lid55qE5p2Q5paZ44CB5qiq5oiq6Z2i56ev44CB5rip5bqm6YO95LiN5Y+Y77yM5pS55Y+Y55S16Zi75aSn5bCP55qE5pa55rOV5piv5pS55Y+Y6ZW/5bqm77yOPGJyPuaVhemAiUHvvI48YnI+PC9wPg==
本课配套习题挑战模式3/5
单选题
难度系数：
3.
如图所示，是大型电子地磅的电路图．当称重物时，在压力的作用下，滑片P向B端滑动，变阻器连入电路的电阻和电流表的示数是（ ）
| A: 变小和变大 |
| B: 变大和不变 |
| C: 不变和变小 |
| D: 变大和变小 |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+5ruR5Yqo5Y+Y6Zi75Zmo5piv6YCa6L+H5pS55Y+Y6L+e5YWl55S16Lev5Lit55S16Zi75Lid55qE6ZW/5bqm5p2l5pS55Y+Y55S16Zi755qE77yM55Sx5Zu+5Y+v55+l77yM5ruR54mHUOWQkeS4i+a7keWKqO+8jOi/nuWFpeeUtei3r+S4reeahOeUtemYu+S4nemVv+W6puWPmOefre+8jOmYu+WAvOWPmOWwj++8jOWImeeUtea1geWPmOWkp++8jjxicj48L3A+
- 答案：QQ==
PHA+5b2T56ew6YeN54mp5pe277yM5ruR54mHUOWQkeS4i+a7keWKqO+8jOi/nuWFpeeahOeUtemYu+WPmOWwj++8jOS9v+eUtei3r+S4reeahOaAu+eUtemYu+WPmOWwj++8jOWPr+W+l+eUtei3r+S4reeUtea1geWPmOWkp+OAgeeUtea1geihqOeahOekuuaVsOWPmOWkp++8jjxicj48L3A+
本课配套习题挑战模式4/5
单选题
难度系数：
4.
某同学安装了一个可以调节亮度的电灯，如图所示，为了使滑动变阻器的滑片从C向D移动的过程中，电灯的亮度逐渐变暗，正确的连接方式是（ ）
| A: M接C，N接A |
| B: M接D，N接B |
| C: M接A，N接B |
| D: M接C，N接B |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+54Gv5rOh5Y+Y5pqX77yM5YiZ6K+05piO5ruR5Yqo5Y+Y6Zi75Zmo5o6l5YWl55S16Lev55qE6Zi75YC85Y+Y5aSnPC9wPg==
- 答案：QQ==
PGRpdj5C44CB6YCJ6aG55ruR54mH55SxQ+WIsETvvIznlLXpmLvlj5jlsI88L2Rpdj48ZGl2PkPjgIHpgInpobnmu5HniYfnlLFD5YiwRO+8jOeUtemYu+S4jeWPmDwvZGl2PjxkaXY+ROOAgemAiemhuea7keeJh+eUsUPliLBE77yM55S16Zi75Y+Y5bCPPC9kaXY+
本课配套习题挑战模式5/5
多选题
难度系数：
5.
图所示是一种油箱内油面高度检测装置的示意图．图中油量表由电流表改装而成，金属杠杆的一端接浮标，另一端触点O接滑动变阻器R．当油箱内油面下降时，下列分析正确的有（ ）
| A: 触点O向下滑动 |
| B: 触点O向上滑动 |
| C: 电路中的电流增大了 |
| D: 电路中的电流减小了 |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 答案：QixE
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
