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Originally Posted by Arcturius
Are lightbulbs different in different parts of the world (i.e. different resistances)?
Applying twice the voltage to a part with the same resistance should double the current through it (and quadruple the power dissipation!)...
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Lightbulbs in different parts of the world are made for their target voltages.
A watt, is a watt, is a watt, no matter what voltage is applied. All that is changes between different scenarios is the resistance of the lightbulb when then dictates how much current flows. Since P = VA (roughly speaking for AC), and P is measured in watts, then a when two different lightbulbs in different voltages consume the same number of watts, then they are still sucking the same amount of power, just with different resistances for each.