(II) You buy a 75-W lightbulb in Europe, where electricityis delivered at 240 V. If you use the bulb in the United Statesat 120 V (assume its resistance does not change), how brightwill it be relative to 75-W 120-V bulbs? [Hint: Assumeroughly that brightness is proportional to power consumed.]

(II) You buy a 75-W lightbulb in Europe, where electricityis delivered at 240 V. If you use the bulb in the United Statesat 120 V (assume its resistance does not change), how brightwill it be relative to 75-W 120-V bulbs? [Hint: Assumeroughly that brightness is proportional to power consumed.]

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter10: Direct-current Circuits

Section: Chapter Questions

Problem 33P: Refer to Figure 10.17 and the discussion of lights dimming when a heavy appliance comes on. (a)...

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Question

(II) 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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