Question

A cell phone charger uses 5.6 Joules of energy per second when plugged

into an outlet but only 1.7 Joules of energy per second actually end up in
the cell phone battery. What is the efficiency of the charger?

1.) 30%

2.) 3.29%

3.) 329%

4.) 9.59%

Answer 1

3 because it is............