03-26-2008, 03:48 AM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 3,401
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The POWER represented by P never changes. P=EI - The E or voltage is a variable and I the current is variable.
60 divided by 240 equals a quarter amp. 60 divided by 120 equals a half amp. Because you are operating the 240 bulb at half its rated voltage the amperage is double its normal operating amperage. Therefore the bulb operates at a half amp.
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