【简答题】一个线圈接在U=120V的直流电源上,I=20A;若接在f=50Hz,U=220V的交流电源上,则I=28.2A。线圈的电感L=( )。
【单选题】一个线圈接在U=120V的直流电源上,I=20A;若接在50Hz,U=220V的交流电源上,则I=28.2A。则线圈的电感L=( )。
【单选题】一个线圈接在U=120V的直流电源上,I=20A;若接在f=50Hz,U=220V的交流电源上,则I=28.2A。试求线圈电阻R和电感L。
【单选题】It' s no secret that many children would be healthier and happier with adoptive parents than with the parents that nature dealt them. That's especially true of children who remain in abusive homes bec...
C.
The traditional practice.
D.
The parents' feelings.
【单选题】一个线圈接在U=120V的直流电源上,I=20A;若接在f=50HZ,U=220V的交流电源上,则I=28.2A。则线圈电阻和电感分别为()。
【简答题】冰融化时,要克服水分子间____、____、____、____作用力,MgO熔化时需破坏____作用力,S溶于CS 2 中要靠它们之间的____作用力。
【简答题】Many parents take on the role of being their children’s preschool teacher and the responsibility of readying them for kindergarten. To achieve this goal, it is important for parents to introduce a var...