Answer :

As we know the relation , which tells us that current is equal to the flow of charge per unit time, that is in t seconds q amount of charge has flown or we can say that in 1 second amount of charge has flown.

We have studied the relation q = n× e

Where q is total amount of charge; n is the number of electrons; e is the amount of charge on 1 electron which has value 1.6 X 10^{-19} C.

And is always constant(n).

In this problem we have to find n that is number of electrons, so we have the value of current I = 1.6 A and time t = 1 sec , and time will be 1 sec if q = 1.6C , as ,

electrons will emerge out of the bulb in one second or per second.

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