Circuit Theory: First-order RL Circuits (basic)

I discuss an overall strategy for handling first-order RL circuits. It is simple: find the initial condition, final condition, and connect the two using an exponential.
I do a very simple example where I find initial and final conditions for inductor current, iL(t), i.e., at t=0 and t=infinity. I do some very simple circuit analysis to determine the time constant for an exponential decay that connects the initial and final conditions.
Finally, I discuss how this relates to the analysis of an RC circuit.