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

Physics

Belinda Hanna

18 August, 02:45

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.

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Answers (1)

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Jace Combs · 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