RC circuit: charge time

1.00 с

To 90%

2.30 с

To 99%

4.61 с

5τ (full)

5.00 с

Charge: V(t) = V₀(1−e^(−t/RC)). Practically full at 5τ. For a 1 s delay at C=100 µF you need R≈10 kΩ (τ=1 s → 63% per second).