[電磁] LR circut

看板TransPhys作者 (Yangbin)時間19年前 (2007/05/14 01:11), 編輯推噓0(0推 0噓 0→)
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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. -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.116.115.13
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