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 (view source)

Revision as of 10:40, 20 August 2024

30 bytes added ,  20 August
→‎理论
* 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，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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