Question

The current in an electric hair dryer is 12
a.part ahow many electrons flow through the hair dryer in 4.4 min ?

Answer 1

a) When we have the current in the electric hair dryer = 12 a

and we have the time which it takes to flow through t = 4.4 *60 

                                                                                           = 264 sec

so we can use the Current (I) & time(t) values to get the charge first:

when charge Q = currrent(I) * time(t)

∴ Q = 12 a* 264 sec

       = 3168 C

b) after we have got the value of charge Q so we will use it to get how many electrons:

when 1 coulomb has→ 6.242 x 10^18 electrons 

so 3168 C has → X electrons


∴ no.electrons = 3168 C * 6.242 x 10^18 / 1 C

                         = 1.98 X 10^22 electrons