Q11 of 46 Page 269

How many electrons flow through an electric bulb every second, if the current that passes through the bulb is 1.6 A.

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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