You buy a 75-W lightbulb in Europe, where electricity is
Chapter 18, Problem 36(choose chapter or problem)
You buy a 75-W lightbulb in Europe, where electricity is delivered at 240 V. If you use the bulb in the United States at 120 V (assume its resistance does not change), how bright will it be relative to 75-W 120-V bulbs? [Hint: Assume roughly that brightness is proportional to power consumed.
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