
电阻与电流相关知识测验

Quiz
•
Physics
•
9th Grade
•
Hard

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FREE Resource
5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
(福建省)在相同温度下,关于导体的电阻,下列说法正确的是( )
铜线的电阻一定比铝线的小
长度相同粗细相同的铜线和铝线电阻相等
长度相同的两根铜线,粗的那根电阻较大
粗细相同的两根铝线,长的那根电阻较大
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
我们在考试时要用2B铅笔,填涂答题卡,2B铅笔的塑料外壳是____,作为铅笔芯的石墨是____;集成电路板主要是由____(前三空选择“导体” “绝缘体” “半导体”)材料制成的,由该材料制成的发光二极管具有____导电性;某些物质在温度很低时,电阻会变成零,这是____现象。
导体
超导现象
半导体导电性
绝缘体
半导体
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列说法正确的是( )
电荷的移动形成电流
电路中有电压就一定有电流
把一根铜丝均匀拉长后电阻变小
长时间使用的手机发烫,是因为电流的热效应
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
(吉林省)有甲、乙两根银铂合金线,甲和乙等长,乙粗些,把它们并联在同一电路中,它们两端的电压分别为U甲和U乙,下列判断中正确的是( )
U甲 = U乙
U甲 < U乙
U甲 > U乙
无法确定
5.
MULTIPLE CHOICE QUESTION
30 sec • 3 pts
(2023常德)有A、B、C三根完全相同的导体,将A导体剪去一半,电阻变为R1;将B导体均匀地拉伸到原来长度的两倍,电阻变为R2;将C导线从中间对折,电阻变为R3。下列电阻大小关系正确的是( )
R1 > R2 > R3
R2 > R1 > R3
R2 > R3 > R1
R3 > R1 > R2
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