Positive SSL
    14.素養(4)
1 如圖所示電路, t = 0 秒前電容器電壓為零,若 t = 0 秒時將開關 S 閉合,則電容器兩端電壓 𝑣c ( t ) 為何? 111 統測
A 60(1-e-0.5t)V
B 20(1-e-0.5t)V
C 60(1-e-0.05t)V
D 20(1-e-0.05t)V

先化戴維寧等效電路

τ=R×C = 40k×50μ = 2s

𝑣c ( t ) =20( 1- e-t/2 ) V

𝑣c ( t ) =20( 1- e-0.5t ) V