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9 November, 14:55

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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  1. 9 November, 18:31
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    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
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