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What is the ratio of the voltage V1 across capacitor C1 in (Figure 1) to the voltage V2 across capacitor C2? Suppose that C2 = 2.1 μF?
回答 (1)
2015-12-14 2:36 am
// = Parallel
<>= Serial
C = C1//(C2<>C3)
= C1//(C2*C3/(C2+C3))
= C1 + C2*C3/(C2+C3)
= (C1*C2 + C2*C3 + C3*C1)/(C2 + C3)
= (2.1 + 2.1 + 1)/(2.1 + 1)
= 52/31 uF
Q = C*V
= 52/31 * 10
= 520/31 uC
V2 = Q/C2
= 520/(31*2.1)
= 7.99 volts
<>= Serial
C = C1//(C2<>C3)
= C1//(C2*C3/(C2+C3))
= C1 + C2*C3/(C2+C3)
= (C1*C2 + C2*C3 + C3*C1)/(C2 + C3)
= (2.1 + 2.1 + 1)/(2.1 + 1)
= 52/31 uF
Q = C*V
= 52/31 * 10
= 520/31 uC
V2 = Q/C2
= 520/(31*2.1)
= 7.99 volts
收錄日期: 2021-05-01 15:38:50
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20151213161202AAXo3pE