# Help with Series RLC circuit

#### wiz0r

Joined May 2, 2008
64
Edited for assignment purposes...

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#### t_n_k

Joined Mar 6, 2009
5,455
Write the KVL differential equation form for the simple series loop comprising the capacitor, inductor and two 60Ω resistors. Use the voltage on 1mF C at t=0 as the initial condition and decide what the current will be at t=∞. You've correctly stated that i(0+)=0.

Then solve the differential equation per standard methods to find i(t).

#### wiz0r

Joined May 2, 2008
64
Write the KVL differential equation form for the simple series loop comprising the capacitor, inductor and two 60Ω resistors. Use the voltage on 1mF C at t=0 as the initial condition and decide what the current will be at t=∞. You've correctly stated that i(0+)=0.

Then solve the differential equation per standard methods to find i(t).
Edited for assignment purposes...

Last edited:

#### t_n_k

Joined Mar 6, 2009
5,455
Looks fine so far.

#### wiz0r

Joined May 2, 2008
64
Edited for assignment purposes...

Last edited:

#### t_n_k

Joined Mar 6, 2009
5,455
Correct - but I'm tired of holding your hand.

#### wiz0r

Joined May 2, 2008
64
Correct - but I'm tired of holding your hand.
Edited for assignment purposes...

PS: I'm really thankful for all your help...

Last edited:

#### wiz0r

Joined May 2, 2008
64
After several headaches and the help of others I found out that:

i(t) = 0.388e^(-10.73 * t) + -0.388e^(-37.26 * t)

Woohoo.. topic closed..

#### thatoneguy

Joined Feb 19, 2009
6,359
This thread will certainly help those who come along in 6 months asking the same question.

#### t_n_k

Joined Mar 6, 2009
5,455
This thread will certainly help those who come along in 6 months asking the same question.
Presumably Wiz0r doesn't want their circuit theory teacher too easily deducing they were receiving help online.