1. The problem statement, all variables and given/known data You have two 120V light bulbs, one 25W and one 100W, that are normally connected in parallel with 120V across each. Your friend had what seemed like a good idea which was to connect them in series across a 240V power line. However, one of them burned out immediately. Which one burned out and why? 2. Relevant equations P=IV P=I^2*R 3. The attempt at a solution If light bulbs are in series, the same current flows through both of them. Should I treat this like a resistor problem and calculate the resistor of the light bulbs in both cases? I'm not sure how to figure out which one burns out.