1. The problem statement, all variables and given/known data #1 Sketch the total source Voltage as a function of time for -∞ < t < +∞ #2 Sketch I(t) for -∞ < t < +∞ #3 Sketch VL for -∞ < t < +∞ 2. Relevant equations In the circuit, there exist a step source, and a constant source. I couldn't find any examples on the web to refer to when plotting graphs for these double source circuits. So, I don't have any relevant equations. 3. The attempt at a solution The simple inductor circuit has been uploaded along with a sketch that attempts to answer #2, and one that attempts to answer #3. I don't know how to sketch for #1. The uploaded photo for #2 has a vertical i axes, and the uploaded photo for #3 has a VL axes. Are these curves satisfying the sketch request? What curve could describe #1 well?