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Homework Statement
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.)
Homework Equations
z = iωL
V = L(dI/dt)
P = V2/z
I(t) = I0cos(ωt)
More?
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!