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Capacitors - Technical MCQs

Q1:

After a capacitor has charged for 1 tc, what percentage of current remains in the resistor?

A 63.2

B 36.8

C 13.5

D 5.0

ANS:B - 36.8

It = It(1-e^-t/T).
t=time,
T= time constant ,
It = total current.

If t = -T then It=I(1-e^-1),
It=0.632It ;
It-0.632It = 0.368It = 36.8% of current.