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itryphysics
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Homework Statement
Consider an RC circuit in which a capacitor is being charged by a battery connected in a circuit. Initially the capacitor is uncharged. Then the switch is closed.
After a time equal to 4.5 time constants, what percent of the final charge is present on the capacitor?
Homework Equations
Q = Qo [1 - e^ (-t/RC)]
The Attempt at a Solution
I picked a value of 100 for Qo
so
Q= 100 [1 - e^ (-t/4.5)]
my approach was going to be to find Q and then see wht percent that is of the initial charge Qo
but I don't know wht to put in for the time "t"
please help me out