How a capacitor keeps TIME

Part 2: a capacitor is a CLOCK ⏱️

Put a resistor in front of it and it fills SLOWLY — fast at first, then slower and slower.

τ = R × C
10 kΩ × 100 µF = 1 second
After 1τ → 63 % full. After 5τ → full.

Double R (or C) = double the time. That's how 555 timers, blinkers and delays work.