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# 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?

242526 ###### 2015-07-15 19:45:54

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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