Question

How many electrons pass through a lamp in one minute. If the current is 220 m.A ?

Answer 1

Answer:

l=220mA=q/t

T=1min=60sec.

Hence, q=l*T=220*10^3*60=13.2C

1.6*10^-19C is the charge of 1 electron

Therefore 13.2C is the change of electron=

= 8.25*10^19 electron.

Answer 2

Answer:

The number of electrons that will pass is 82.5*10¹⁸.

Explanation:

Given:

Current(I)=220mA

Time(t)=1 minute=60 seconds

To find: The number of electrons passing=?
Solution:

We know that,

$q=It$

=220*10³*60=13.2 Columb

∴q=13.2 Columb

The number of electrons in 1 Columb of charge is 6.25*10¹⁸

Therefore, the number of electrons in 13.2 Columb of charge=13.2*6.25*10¹⁸=82.5*10¹⁸

Thus, the number of electrons that will pass is 82.5*10¹⁸.