1. The problem statement, all variables and given/known data How large an inductance should be connected in series with a 120 volt (rms), 60 watt light bulb if it is to operate normally when the combination is connected across a 240 volt, 60 Hz line? (First determine the inductive reactance required. You may neglect the resistance of the inductor and the inductance of the light bulb.) 2. Relevant equations z = iωL V = L(dI/dt) P = V2/z I(t) = I0cos(ωt) More? 3. The attempt at a solution I'm essentially stuck at the beginning of this problem. All I've done so far is calculate the inductive reactance = 120πL, but I have no idea where to go from there. All help is greatly appreciated!