I might need all this in simpler terms, or I should have added this is a maths question with an electronics twist (this is more a long calculus math question) what was I right with?
Are you saying 63.2% as a charge time after one time constant is universal? A change in capacitor voltage and...
A 22kilaohm resistor is connected in series with a 100nF capacitor under a 5v supply voltage.
Vc = V (1 - e^(-t/T))
The capacitor is fully charged to the supply voltage, use the discharging equation to show the value of the capacitor voltage as a percentage of voltage V after it has discharged...