Difference between revisions of "怎样考取低压电工证理论篇"
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怎样考取低压电工证理论篇
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* P=UI,电功率=电压*电流,电功率瓦特=伏特*安培
* V=IR,U=IR,电压=电流*电阻,伏特=安培*欧姆
* Q=
VC,
UC,
库仑=伏特*法拉
* 万用表实质是一个带有整流器的磁电式仪表.万用表由表头、测量电路及转换开关三个主要部分组成.滚轮卡棘轮
* 三相笼形异步电机有直接启动、降压启动两种方式。降压启动又分:定子串电抗,星三角形,软起动器,自耦变压器,串电阻
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