physics
posted by Jason .
What is the voltage across a capacitor after a time of two constants when a. charging from zero voltage and b. discharging from a fully charged condition?

U₀ is the max charge of capacitor.
Discharging
U=U₀exp(t/T)=
=U₀exp(2T/T)=
=U₀exp(2)=0.135U₀
Charging
U=U₀{1exp(t/T)}=
= U₀{1exp(2)}= U₀(10.135)=0.865U₀
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