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Electricity question

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I'm trying to catch up on some basic electricity facts for a night light.  The night light takes a 9V battery.  The light puts out 4.5W.  If a Duracell 9V has a capacity of 550mAh, about how many days will it run?

 

A.  4 days

B.  27 days

C.  46 days

D.  96 days


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