电学2 期末测试
Authored by luohua lu
Science
7th Grade
Used 8+ times
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22 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
现在有一个LED灯需要点亮，该选择哪一种电源
12V
9V
220V
5V
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
光敏电阻受到光照，电阻会__
变大
变小
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
光线传感器，当它收到较强的光照时，检测信号D0接口，数值可能是
1
0
1024
255
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
光线传感器，当它收到较强的光照时，检测信号A0接口，数值可能是
1
0
1024
255
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
使用电压表在一段时间内测量led电压数值，测出的数值是
模拟量
数字量
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
记录一个开关在一段时间内的开关状态，它是
模拟量
数字量
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
电位器的本质是？
一段可调导线
一个可调电阻
一个可调电压
一个可调电流
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