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Treating this as an ideal resistance, voltage will be half, so current will be half. Power (which is V * I) is one fourth, so you will only draw 10W.

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โˆ™ 2015-07-15 19:45:54
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Q: If you put a 240V 40W bulb with A19 base into a 120V fixture will the lumination be 40W or 20W because the current is one-half?
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