When a capacitor is charging how does the circuit's current, p.d. across capacitor and charge across capacitor change with time?
When charging, current follows an exponential decay curve as less and less current flows as the capacitor gets closer to being fully charged. For p.d. and charge, the curve follows an inverse exponential curve. The capacitor charges a lot to begin with but, as the capacitor starts to resist the current, it gets harder and harder to charge to full capacity meaning less p.d. and charge is added per second.