Question

A 100-W light bulb has an average lifetime of 800 h. how many electrons Move through the bulb in its life?

Answer 1

100 = V i
so i = 100watts/110 volts=about 1 coulomb/second (you use calculator)
e = 1.6*10^-19 coulomb
so
(1/1.6)*10^19 electrons/second

so 800 hours = 800*3600 seconds
= 8*3.6*10^5 seconds

so
(8*3.6/1.6)* 10^24 electrons (quite a few)