If 1.0 A of current are passing through a wire how many electrons pass through a cross-section of the wire in 1.0 hours?
i = current in the wire = 1 A
t = time duration = 1 hour = 60 min = 3600 sec
Q = charge passed
Q = i t
Q = 1 x 3600 = 3600 C
n = number of electrons
e = charge on each electron = 1.6 x 10-19 C
Using the formula
Q = ne
3600 = n (1.6 x 10-19)
n = 2.25 x 1022
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