作者Yangbin (Yangbin)
看板TransPhys
标题[电磁] LR circut
时间Mon May 14 01:11:46 2007
In an LR circut ,the current rises to 40% of its final value in 40 ms .
a)How long does it take to reach 80% of the final value?
b)If R=12 ohm ,what is L.
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 140.116.115.13