专业辅导 发表于 2012-1-15 16:28:23

判断交流电与直流电口诀

电笔判断交直流，交流明亮直流暗， k\A8Z[
交流氖管通身亮，直流氖管亮一端。 i&RPY bT{
说明： G;MmD?VJ        g
首先告知读者一点，使用低压验电笔之前，必须在已确认的带电体上验测；在未确认验电笔正常之前，不得使用。判别交、直流电时，最好在“两电”之间作比较，这样就很明显。测交流电时氖管两端同时发亮，测直流电时氖管里只有一端极发亮。 c5pF?kFaD
6Wl+5 a6V
判断直流电正负极口诀： Y$shn]~
电笔判断正负极，观察氖管要心细，a?_N8|k[
前端明亮是负极，后端明亮为正极。 V0XQG}
说明： 4u0=/pfi[
氖管的前端指验电笔笔尖一端，氖管后端指手握的一端，前端明亮为负极，反之为正极。测试时要注意：电源电压为110V及以上；若人与大地绝缘，一只手摸电源任一极，另一只手持测民笔，电笔金属头触及被测电源另一极，氖管前端极发亮，所测触的电源是负极；若是氖管的后端极发亮，所测触的电源是正极，这是根据直流单向流动和电子由负极向正极流动的原理。

跑韩国刚 发表于 2015-3-22 10:19:32



   不会刷墙的吧

平均丰拍 发表于 2015-4-3 21:37:27


很可能是煮的

MHrcn6nHk8A 发表于 2015-7-15 15:19:40

a teacher Peng's supervision and guidance

connection of Italy, post classical yoga. such cize beachbody as a large pool of talent in place. in order to make their reproach, also have so many people, can do better 21 day fix than me.通过激发人体潜在能量来促进身体健康. the highest level - finally reached three. carefully consider a week after I made x-pression kanekalon braiding hair the decision.
   all courses are in yoga teaching comprehensive piyo chalene johnson quality comprehensive training for the purpose, a teacher Peng's supervision cartier ring and guidance, all courses are in yoga cartier ring collection teaching comprehensive quality comprehensive training training mask for the ombre brazilian hair purpose.

{压力管道} 发表于 2015-11-18 05:37:10

共同发展！学习才会进步，谢了
页: [1]
查看完整版本: 判断交流电与直流电口诀