本课配套习题挑战模式1/5
单选题
难度系数:
1.由欧姆定律公式I =变形得R =,对此,下列说法中正确的是()
A: 加在导体两端的电压越大,则导体的电阻越大 |
B: 通过导体的电流越大,则导体的电阻越小 |
C: 当导体两端的电压为零时,导体的电阻也为零 |
D: 导体的电阻跟导体两端的电压和通过导体的电流无关 |
一次做对,真牛!
+5奖励规则>
- 提示1:5a+85L2T55qE55S16Zi76Lef5a+85L2T5Lik56uv55qE55S15Y6L5ZKM6YCa6L+H5a+85L2T55qE55S15rWB5peg5YWz77yM5Y+q5LiO5a+85L2T55qE5p2Q5paZ44CB6ZW/5bqm44CB5qiq5oiq6Z2i56ev5ZKM5rip5bqm5pyJ5YWz
- 答案:RA==
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本课配套习题挑战模式2/5
单选题
难度系数:
2.在测量小灯泡电阻的实验中,正确连接电路并闭合开关后,电压表和电流表的示数如图所示。则小灯泡的电阻为()
A:0.5Ω |
B: 4Ω |
C: 5Ω |
D: 2.5Ω |
一次做对,真牛!
+5奖励规则>
- 提示1:55S15Y6L6KGo5ZKM55S15rWB6KGo6K+75pWw5pe26KaB5rOo5oSP5omA6YCJ6YeP56iL
- 答案:Qw==
55Sx5Zu+5Y+v55+l77yM55S15rWB6KGo5L2/55So55qEMO+9njAuNkHph4/nqIvvvIznga/ms6HnlLXmtYHkuLowLjVB77yb55S15Y6L6KGo5L2/55So55qEMO+9njNW6YeP56iL77yM54Gv5rOh5Lik56uv55S15Y6L5Li6Mi41VuOAgjxpPlI8L2k+ID08aW1nIHdpZHRoPTIxIGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzczLzIyL3JCQUNFMVRJbjViQUJfbTJBQUFCbGlwUGlFODA5MS5wbmciPj08aW1nIHdpZHRoPTQxIGhlaWdodD00NCBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzNFL0VEL3JCQUNKMVRJbjVuUlVPRnFBQUFDbkRTbmtUdzcxMi5wbmciPj01zqnvvIzmlYXpgIlDLg==
本课配套习题挑战模式3/5
单选题
难度系数:
3.关于电压,下列说法正确的是()
A: 有电源就一定有电压且有电流 |
B: 电压就是电的压力 |
C: 电压是形成电流的条件之一 |
D: 有电压就一定能形成电流 |
一次做对,真牛!
+5奖励规则>
- 提示1:6I635b6X5oyB57ut55S15rWB55qE5p2h5Lu25piv77ya5pyJ55S15Y6L5ZKM55S16Lev5aSE5LqO6YCa6Lev54q25oCB
- 答案:Qw==
6I635b6X5oyB57ut55S15rWB55qE5p2h5Lu25piv77ya5pyJ55S15Y6L5ZKM55S16Lev5aSE5LqO6YCa6Lev54q25oCB77yM5pWF6YCJQy4=
本课配套习题挑战模式4/5
单选题
难度系数:
4.
在下面电路中,已知R1=6Ω,R2=10Ω,当开关闭合时,V1的示数为3V,则电路中的电流大小为()
A: 0.2A |
B: 0.3A |
C: 0.4A |
D: 0.5A |
一次做对,真牛!
+5奖励规则>
- 提示1:PHA+5qyn5aeG5a6a5b6L5YWs5byPST1VL1I8L3A+
- 答案:RA==
PHA+55Sx5bey55+l5b6X77yMUjxzdWI+MTwvc3ViPj02zqnvvIxSPHN1Yj4xPC9zdWI+55qE55S15Y6L5Li6M1bvvIzmoLnmja7mrKflp4blrprlvovlhazlvI9JPVUvUuWPr+W+l+eUtea1gUk9MC41Qe+8jOeUseS6juS4suiBlOeUtei3r+S4reWQhOWkhOeUtea1geebuOetie+8jOaJgOS7peeUtei3r+S4reeahOeUtea1geWkp+Wwj+S4ujAuNUHvvIzmlYXpgIlELjwvcD4=
本课配套习题挑战模式5/5
单选题
难度系数:
5.如图所示,当滑片P向右滑动时,电表示数变化()
A: 电压表示数变大 |
B: 电流表示数变大 |
C: 电压表示数不变,电流表示数变大 |
D: 电压表示数变小,电流表示数不变 |
一次做对,真牛!
+5奖励规则>
- 提示1:55S16Lev5Li65Lik5a6a5YC855S16Zi75Liy6IGU55qE55S16Lev
- 提示2:55S15Y6L6KGo5rWL5LiA6YOo5YiG55S16Zi755qE55S15Y6L
- 答案:RA==
55S16Lev5piv55Sx5Lik5a6a5YC855S16Zi757uE5oiQ55qE5Liy6IGU55S16Lev77yM55S16Lev55qE5oC755S15Y6L5ZKM5oC755S16Zi76YO95LiN5Y+Y77yM5omA5Lul5qC55o2u5qyn5aeG5a6a5b6L55S16Lev55qE55S15rWB5LiN5Y+Y77yb55Sx5LqO55S15Y6L6KGo5rWL5LiA6YOo5YiG55S16Zi755qE55S15Y6L77yM5b2T5ruR54mHUOWQkeWPs+a7keWKqOaXtu+8jOaJgOa1i+mDqOWIhueahOeUtemYu+WHj+Wwj++8jOiAjOeUtea1geWPiOS4jeWPmO+8jOagueaNruasp+WnhuWumuW+i+eUteWOi+WHj+Wwj++8jOaJgOS7peeUteWOi+ihqOeahOekuuaVsOWHj+Wwj++8jOaVhemAiUQu