1. The problem statement, all variables and given/known data I have to calculate first commutation process (t=0) and second commutation process (t = 2*τ) Both swithes are closing in the given time moment as I wrote before. 2. Relevant equations 3. The attempt at a solution I'll do this task step by step, that's why here isn't full of my own solution yet. First of all, I want to ask few questions to be sure: This is same circuit as before? And then this is circuit of first commutation: If it's true, I'll start to write equations for both commutations.