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Originally Posted by bearcat58
Light bulb have a fixed filament resistance and it’s watt rating is based off of the amount of voltage applied. Resistance is defined as a resistance of current flow. So this 100W bulb at 220V will only allow 0.4545 amps of current to flow. The resistance will still remain the same.
If we drop the volts and maintain the current……..then 120V x 0.4545A will yield 54.54W of Power.
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thats what i thought too, but apparently not according to the book
