Homework Help: RL Circuits problem

1. Dec 6, 2011

pukeynut

1. The problem statement, all variables and given/known data
For the circuit shown, find i(t) for t>0
http://img440.imageshack.us/img440/5158/cicuit.jpg [Broken]

2. Relevant equations
To simplify the resistors we use a Wye-Delta transform so:
R1 = RbRc/(Ra+Rb+Rc)
R2 = RcRa/(Ra+Rb+Rc)
R3 = RaRb/(Ra+Rb+Rc)

Then the Kirchoff current law on the nodes to calculate i(o).

3. The attempt at a solution

I can do the Wye-Delta transform no problem, but am having serious trouble in calculating i(o). After that it's a fairly straightforward problem.

Any help would be massively appreciated!
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

Last edited by a moderator: May 5, 2017
2. Dec 6, 2011

Staff: Mentor

What have you tried? What's giving you trouble?

3. Dec 6, 2011

Staff: Mentor

Will you be determining a differential equation, then solving it, to find the transient current through the inductor? Or what method will you be using?