Question

A bulb rated 200w , 100 v then no. Of electrons passing thorugh bulb in one second

Answer 1

The bulb is rated 200W

so,   power = I x V

            200  =  I  x  100                                         (v = 100 V)

                  I  =   2 A

It means 2 coulomb of charge flows in 1 sec. (Since I= Q/t)

                1 electron  =  1.6 x 10⁻¹⁹ C

               1 C  =  (1 / 1.6 x 10⁻¹⁹ )  electrons

               2 C =  (2 / 1.6 x 10⁻¹⁹)  electrons

               2 C = 1.25 x 10¹⁹ electrons

But 2 C charge flows per second.

THUS, 1.25 x 10¹⁹ ELECTRONS FLOW PER SECOND..

HOPE U UNDERSTOOD  !!