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06-29-2008   #2 (permalink)
Pandaccoon
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An ampere is one coulomb of charge going past a given point in the duration of one second.
I = Q/t
Q = It
where Q is your coulomb of charge, I is your current and t is time in seconds.
Since we have 2 Amperes, thats 2 coulombs of charge going through your lamp filament per second. The question asks for coulombs per minute so you just convert 2coulombs/sec to number of coulombs/1minute:

(2coulombs/1sec) * (60sec/1minute) = 120 coulombs per minute
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Last edited by Pandaccoon; 06-29-2008 at 12:32 AM.