Posted by Anonymous on Friday, February 15, 2013 at 2:18am.
The current will be
I = P/V = 60/120 = 0.5 A
which is 0.5 Coulombs per second.
10^9 electrons will pass through in time t such that
(0.5 C/s)* t = 10^9(electrons)*1.6*10^-19 (C/electron)
t = 3.2*10^-10 s
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