中学生网络课堂
初三物理 (北师版)
欧姆定律的应用
本课配套习题挑战模式1/5
单选题
难度系数：
1.如图所示，电源的电压为U，A为理想电流表，V1和V2为理想电压表，R1为定值电阻，R2为滑动变阻器，那么，当闭合开关S后，下列说法中正确的是（ ）
| A: 当滑动变阻器R2的阻值不变时，V1的示数与A的示数之比等于R2 |
| B: 当滑动变阻器R2的阻值不变时，V2的示数与A的示数之比等于R1 |
| C: 当滑动变阻器R2的阻值增大时，V2示数的变化量与A示数的变化量的绝对值之比等于R2 |
| D: 当滑动变阻器R2的阻值减小时，V1示数的变化量A示数的变化量的绝对值之比等于R1 |
一次做对，真牛！
+5奖励规则>
- 提示1：IOWumuWAvOeUtemYu+eahOmYu+WAvOetieS6juWug+S4pOerr+eahOeUteWOi+S4jumAmui/h+Wug+eahOeUtea1geeahOavlA==
- 提示2：IOWumuWAvOeUtemYu+eahOmYu+WAvOetieS6juWug+S4pOerr+eUteWOi+ihqOekuuaVsOeahOWPmOWMlumHj+S4jumAmui/h+Wug+eUtea1geWPmOWMlumHj+e7neWvueWAvOeahOavlA==
- 答案：RA==
PGRpdj7op6PvvJog5rGC5a6a5YC855S16Zi755qE6Zi75YC85pa55rOV5pyJ5Lik56eN77yaPC9kaXY+PGRpdj4xLuetieS6juWug+S4pOerr+eahOeUteWOi+S4jumAmui/h+Wug+eahOeUtea1geeahOavlDwvZGl2PjxkaXY+Mi7nrYnkuo7lroPkuKTnq6/nlLXljovnmoTlj5jljJbph4/kuI7pgJrov4flroPnlLXmtYHlj5jljJbph4/nu53lr7nlgLznmoTmr5TvvIzlkIzml7bkuZ/nrYnkuo7kuI7lroPkuI3nm7jlubLnmoTlhbblroPnlLXpmLvkuKTnq6/nlLXljovlj5jljJbph4/kuI7nlLXmtYHlj5jljJbph4/nu53lr7nlgLznmoTmr5TjgILmiYDku6XmraPnoa7nrZTmoYjkuLpEPC9kaXY+
本课配套习题挑战模式2/5
单选题
难度系数：
2.如图所示的电路中，电源电压保持不变，R2、R3是两个定值电阻. 闭合开关S、滑片P向左滑动：当电流表示数变化量的绝对值为△I时，电压表示数变化量的绝对值为△U；当电流表示数变化量的绝对值为△I′时，电压表示数变化量的绝对值为△U′. 若△I＜△I′，则（ ）
A:  |
B:  |
C:  |
D:  |
一次做对，真牛！
+5奖励规则>
- 提示1：IOeUteWOi+ihqOa1i1I8c3ViPjE8L3N1Yj7kuKTnq6/nlLXljovvvIzlroPkuKTnq6/nlLXljovlj5jljJbph4/nrYnkuo5SPHN1Yj4yPC9zdWI+44CBUjxzdWI+Mzwvc3ViPuS4pOerr+eUteWOi+WPmOWMlumHj+OAgg==
- 提示2：IOKWs1XlkozilrNJ77yb4pazVeKAsuWSjOKWs0nigLLliIbliKvlr7nlupTkuKTnp43nirbmgIHjgII=
- 提示3：IDxpbWcgd2lkdGg9MTMwIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzI0LzI4L3JCQUNFMU1NbEJ5emF0NFhBQUFDdDF5RnlQbzIzNS5wbmciPjxpbWcgd2lkdGg9MTIyIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzAxLzNBL3JCQUNGRk1NbEJ5ZzhhMERBQUFDdGd3WVhoMDM3OC5wbmciPg==
- 答案：Qw==
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
本课配套习题挑战模式3/5
单选题
难度系数：
3.
如图所示，电源两端电压不变，电阻R1的阻值为8Ω。闭合开关S，当滑动变阻器的滑片P位于A点时，电压表V1的示数为11V，电压表V2的示数为8V。当滑动变阻器的滑片P位于B点时，电压表V1的示数为10V，电压表V2的示数为4V。则电阻R2的阻值为（ ）. 
| A: 8Ω |
| B: 6Ω |
| C: 2Ω |
| D: 4Ω |
一次做对，真牛！
+5奖励规则>
- 提示1：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
- 提示2：PHA+PGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzAxLzNBL3JCQUNGRk1NbEJfeVlPOS1BQUFDV0dKZ2xVQTkxNS5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMDEvM0EvckJBQ0ZGTU1sQl95WU85LUFBQUNXR0pnbFVBOTE1LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9Ijc3Ij48L3A+
- 答案：Qw==
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
本课配套习题挑战模式4/5
单选题
难度系数：
4.如图甲所示电路，R1为滑动变阻器，R0、R2均为定值电阻，电源两端电压保持不变. 改变滑动变阻器R1的滑片位置，两电压表示数随电流变化的图线分别画在图乙所示的坐标系中. 根据以上条件可知电阻R0的阻值为（ ）
| A: 3Ω |
| B: 5Ω |
| C: 2Ω |
| D: 6Ω |
一次做对，真牛！
+5奖励规则>
- 提示1：IOaYjuehrlY8c3ViPjE8L3N1Yj7jgIFWPHN1Yj4yPC9zdWI+5rWL6LCB55qE55S15Y6L77yM5piO56Gu5LmZ5Zu+5Lit5Lik5p2h57q/5YiG5Yir5a+55bqU5ZOq5Liq55S15Y6L6KGo
- 提示2：IOWcqOS5meWbvuS4reWvueW6lFY8c3ViPjI8L3N1Yj7nmoTnur/kuIrmib7liLDkuKTkuKrngrnvvIzor7vlh7rlr7nlupTnmoTnlLXljovlgLzlkoznlLXmtYHlgLw=
- 提示3：IOagueaNrjxpbWcgd2lkdGg9NjggaGVpZ2h0PTQyIHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMDEvM0EvckJBQ0ZGTU1sQ0xUVFAtVUFBQUNQVlQwcFRRODYxLnBuZyI+77yM5rGC5Ye6UjxzdWI+MDwvc3ViPj0yPGltZyB3aWR0aD0xMyBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8yNC8yOS9yQkFDRTFNTWxDTGhQZC11QUFBQk5TY2NxbW84MzgucG5nIj4=
- 答案：Qw==
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
本课配套习题挑战模式5/5
单选题
难度系数：
5.
下图所示 ，R1为滑动变阻器，R0、R2为定值电阻，电源两端电压 12V不变。改变滑动变阻器R1滑片位置，V1、V2两电压表以及电流表的示数将发生相应变化。V1、V2两电压表示数变化量与电流表示数变化量的关系图线分别为图乙中①、②直线。根据以上条件可知当电流表示数为0.2A时，滑动变阻器接入电路的阻值为（ ）
| A: 10Ω |
| B: 20Ω |
| C: 30Ω |
| D: 40Ω |
一次做对，真牛！
+5奖励规则>
- 提示1：PHA+VjxzdWI+MTwvc3ViPuihqOeUteWOi+WPmOWMlumHj+etieS6jlI8c3ViPjA8L3N1Yj7kuKTnq6/nlLXljovlj5jljJbph488L3A+
- 提示2：PHA+VjxzdWI+Mjwvc3ViPuihqOeUteWOi+WPmOWMlumHj+etieS6jlI8c3ViPjI8L3N1Yj7kuKTnq6/nlLXljovlj5jljJbph488L3A+
- 提示3：PHA+5b2T55S15rWB6KGo56S65pWw5Li6MC4yQeaJgO+8jOeUtei3r+S4reaAu+eUtemYu+S4ujYwzqk8L3A+
- 答案：Qw==
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
