A cell phone charger operates at 5 volts and can deliver a maximum current of 1.0 Amp. If your cell phone has an energy storage capacity of 38.9~38.9 kiloJoules, what is the shortest possible time (in hours) it would take to fully charge your empty phone battery using this charger.

Question

Sunday

Physics

19 September, 03:47

A cell phone charger operates at 5 volts and can deliver a maximum current of 1.0 Amp. If your cell phone has an energy storage capacity of 38.9~38.9 kiloJoules, what is the shortest possible time (in hours) it would take to fully charge your empty phone battery using this charger.

+3

Answers (1)

Know the Answer?

Galloway · Answer 1

it takes 2.16 hrs to fully charge the phone

Explanation:

V = 5v

I = 1A

E = 38.9 Kj = 38900 j

t = ?

E = IVt

t = E/IV

t = 38900 : (1 * 5)

t = 38900 : 5

t = 7780 seconds

t = 7780/3600 ... (converting time in seconds to hours)

t = 2.16 hrs