01-06-2015
Physics

Answered

A current of 120 mA flows past a point in a circuit for 25 s.
How much charge passes the point in this time?
How many electrons pass the point in this time?

Answer :

hunaifirst hunaifirst

01-06-2015

a) I = 120 mA = 120 x 10^(-3) A = 0.12
A = 0.12 C/s ... [b/c 1 A = 1 C/s]
t = 25 s
I = Q/t
Q = It
Q = 0.12 * 25 = 3 C
so 3C of charge passes the point during the
25 s interval

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