billrussell42
τ = RC = 5 µF x 0.8 MΩ = 4 sec
Q = CV = 5 µF x 12 v = 60 µC
v = v₀e^(–t/τ)
v = 12e^(–1) = 4.41 volts
zero
voltage on a cap, discharging
v = v₀e^(–t/τ)
v₀ is the initial voltage on the cap
v is the voltage after time t
R is resistance in ohms
C is capacitance in farads
t is time in seconds
RC = τ = time constant