# Transients

Discussion in 'Homework Help' started by stobbz, Jan 12, 2011.

1. ### stobbz Thread Starter New Member

Jan 7, 2011
7
0
Regarding a DC circuit with a capacitor.
I have obtained an expression for the capacitor voltage:

Vc(t) = 4 + 2e^-150t

How do determine the capacitor current?

I know that i = C * dv/dt, but not sure how to apply it.

Any tips?

2. ### Georacer Moderator

Nov 25, 2009
5,151
1,266
As the formula suggests, differentiate the voltage to get to the current.
Namely: $i=C\cdot \frac{d(4+2e^{-150t})}{dt}$. Can you handle that?

Jan 7, 2011
7
0