Question

How many electrons flow through filament of 120V -60W lamp in 1 second ?

Answer 1

`P=U.i\\ \\ 60=120i\\ \\ i=0.5 \ A \\ \\ i=(\Delta Q)/(t)\\ \\ \Delta Q=i.t\\ \\ \Delta Q = 0.5 \ C\\ \\ Q=n.e\\ \\ n=(Q)/(e)\\ \\ n=(0.5)/(1.6*10^(-19))=0.3125*10^(20)=3.125*10^(21) \ electrons`