1
ℰ − iR − qC = 0
i = dqdt
Rdqdt + qC = ℰ
2
q(t) = Cℰ(1 − e−t/RC)
i(t) = dqdt = ℰRe−t/RC
VC = qC = ℰ(1 − e−t/RC)
3
τ = RC
Ω·F = VA·CV = CA = s
e−1 ≈ 0.37
4
Rdqdt + qC = 0
q(t) = q0e−t/RC
i(t) = −q0RCe−t/RC