resistor problem
2010-01-19 4:51 am
回答 (1)
2010-01-19 5:10 am
✔ 最佳答案
Equivalent resistance in the parallel arrangement= (10+20)//30 ohms = 30//30 ohms = 30x30/(30+30) ohms = 15 ohms
hence voltage across the parallel arrangement
= 12 x 15/(15+15) v = 6 v
voltage across 20-ohm resistor = 6 x 20/(10+20) v = 4 v
power dissipated in 20-ohms resistor
= 4^2/20 w = 0.8 w
收錄日期: 2021-04-29 17:35:24
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https://hk.answers.yahoo.com/question/index?qid=20100118000051KK01517