列明算式
已知:(R1)=6Ω ,(R2)=9Ω,
且(R1)與(R3)串聯接到某電源上,(R3)兩端的電壓為4V ;
(R2)與(R3)串聯接到同一電源上,(R3)兩端的電壓為3V.
求:(一) (R3)的電阻 (二)電源電壓
有關電阻的問題
2007-09-08 5:44 am
回答 (1)
2007-09-08 6:05 am
✔ 最佳答案
R₃=3 Ωvoltage of the power supply=12 V
Let V be the voltage of the power supply
V/(R₁+R₃)= 4/ R₃
V/(6+R₃)= 4/ R₃ (1)
V/(R₂+R₃)= 3/ R₃
V/(9+R₃)= 3/ R₃ (2)
Since V≠0 and R₃≠0, (1)/(2) we have
(9+R₃) /(6+R₃)=4/3
27+3R₃=24+4R₃
R₃=3 Ω
Substitute R₃=3 into (1)
V/(6+3)=4/3
V=12 V
參考: 自己
收錄日期: 2021-04-13 13:22:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070907000051KK03667