Positive SSL
    14.素養(4)
1 有一電容器接於一直流電壓,其儲存的電荷量為3000 μC,能量為150 mJ,則此電容器的電容值為多少? 106 統測
A 10μF
B 30μF
C 40μF
D 60μF

`W=1/2CV^2`;`Q = CV`;`V = Q/C`

`W=1/2C (Q/C)^2 = 1/2Q^2/C`

`C = Q^2/(2W)`

` = (3000μ)^2/(2*150m)`

` = (9μ)/(300m)`

` = (9000μ)/(300)`

30μF