Question

39. Calculate the number of electrons drifting per second
through the filament of a 100 W-220 V bulb, when
glowing (e = 1.6 x 10-19​

Answer 1

Answer:

24×10^10

Step-by-step explanation:

100% WRONG ANSWER

Answer 2

For a 100 W-220 V bulb to be sustained we must find the current required using the following formula:

P=VI

100=220×I

I=0.4545..Ampere

Current=(Charge/time)

I=Q/t

We have, t=1 sec, Q=0.4545C

1 electron has a charge of 1.6×10-¹⁹ and we need 0.4545 Coloumb/second to make the bulb glow.

I= 0.4545 / 1.6×10-¹⁹

I= 2.84×10¹⁸

So every second, 2.84×10¹⁸ electrons drift through the filament.

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