二上 第十一章 电流、电阻和电压
Quiz
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Science
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9th Grade
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Practice Problem
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Chung Tay
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21 questions
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1.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
绝缘体不容易导电是因为绝缘体:
没有自由电荷
没有正电荷
几乎没有电子
几乎没有自由电荷
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
电阻是导体对电流的阻碍作用,所以:
有电流通过导体就有电阻,没有电流通过导体就没有电阻
电阻是导体本身的性质,不管有没有电流通过,导体的电阻是一定的
通过导体的电流强度逐渐增大,则导体的电阻也逐渐增大
导体的电阻只和导体的长度和横截面积有关
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
导体电阻的大小与下列因素无关的是(不计温度对电阻的影响):
导体的材料
导体的横截面积
导体的长度
导体中的电流
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
电路中一根铝导线电阻为R,要使连入电路中的铝导线电阻变小,可采取的措施是:
将铝导线拉长后连入电路中
将铝导线对折后连入电路中
增大铝导线两端的电压
减小通过铝导线的电流
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
电阻的国际单位是:
安培
伏特
欧姆
焦耳
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
电压的国际单位是:
安培
伏特
欧姆
焦耳
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
电流的国际单位是:
安培
伏特
欧姆
焦耳
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