Question

27. How many electrons pass through a lamp in
one minute, if the current is 300 mA?
(e - = 1.6 x 10-"C) (Ans. 1.125 x 1029)
7.​

Answer 1

Answer:

Q=ne and I=Q/t

Explanation:

Q=I×t = 0.3A × 60 seconds (As 1mA=10^-3 A)

Q=18C

now, e=1.6×10^-19 C (charge on 1 electron)

so n=Q/e

I. e ..... n=18/(1.6×10^-19) = 1.125× 10^20 electrons.

Hope it helps you! :)