Question

how many electrons pass through a lamp in one minute if the current is 300 Milli ampere?​

Answer 1

Answer:

Here, current I = 300 mA = 0.3 A

time t = 1 minute = 60 seconds

Now, charge Q = I x t = 0.3 x 60 = 18 coulomb

and no. of electrons = (total charge)/(charge on 1 electron)

no. of electrons = (18)/(1.6 x 10-19)

= 1.125 x 1020 electrons

hope you find it helpful :)

Answer 2

1.125 × 10^20 electrons pass through a lamp in one minute if the current is 300 mA.

Given,

current, I = 300 mA

time = 1 min = 60 seconds

To find,

The number of electrons, 'n' passing through the lamp.

Solution,

The given current, I = 300 mA = 0.3 A

and the time, t = 60 seconds

since we know the charge,

Q = I x t

= 0.3 x 60 = 18 C

now, number of electrons

n = Q/e (Q = total charge, e = charge of an electron)

⇒n = (18)/(1.6 x $10^{-19$)

⇒ n = 1.125 x $10^{20$

Hence, we can conclude that the number of electrons passing through the lam in a minute is 1.125 × 10^20.

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