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    samybazizi's Avatar
    samybazizi Posts: 1, Reputation: 1
    New Member
     
    #1

    Jul 24, 2017, 11:14 AM
    How long would it take to charge an iPhone with the kinetic energy of a spinning fid
    How long would it take to charge an iPhone with the kinetic energy of a spinning fidget spinner?
    How long would it take to charge an iPhone with the kinetic energy of a spinning fidget spinner?
    smoothy's Avatar
    smoothy Posts: 25,495, Reputation: 2853
    Uber Member
     
    #2

    Jul 24, 2017, 02:40 PM
    3 weeks 2 days, 16 hours 12 minutes and 45.3 seconds.
    talaniman's Avatar
    talaniman Posts: 54,328, Reputation: 10855
    Expert
     
    #3

    Jul 24, 2017, 02:45 PM
    I have to disagree with Smoothy as it may never fully charge up.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,379, Reputation: 2280
    Home Repair & Remodeling Expert
     
    #4

    Jul 24, 2017, 04:10 PM
    14 days, the answer is always 14
    ma0641's Avatar
    ma0641 Posts: 15,681, Reputation: 1012
    Uber Member
     
    #5

    Jul 25, 2017, 01:04 PM
    According to the Apple's study, it takes about about 10.5 watt-hours of electricity to fully charge the iPhone 6. Using the U.S. average retail price of electricity, which is 12.29 cents per kilowatt-hour, that means fully charging your iPhone 6 once each day for a full year will cost a total of… $0.47. Buying a Fidgit costs more than that, even buying it at Dollar Tree and your hand and wrist won't be disabled.
    ebaines's Avatar
    ebaines Posts: 12,132, Reputation: 1307
    Expert
     
    #6

    Jul 25, 2017, 06:39 PM
    Rough calculation:

    The energy that you impart into a spinner when you flick it is equal to the force from your finger times the length of time you apply that force. Let's make an estimate that the force is 1 newton and is applied for 1/2 second. The amount of energy that you impart is therefor estimated to be 1 N x 1/2 s = 1/2 joule. If we take ma0641's data of 10.5 watt-hours of electricity to fully charge an iPhone, and given that this equivalent to 10.5 watt-Hr x 3600 s/Hr = 37800 joules of energy, this means if you had a way to convert the 1/2 joule of kinetic energy in the fidget spinner into electricity you would have to do this 75,600 times. So - the answer to your question depends om how long it would take you to spin a fidget spinner 75,600 times? If you could do it once per second it would take about 21 hours.
    talaniman's Avatar
    talaniman Posts: 54,328, Reputation: 10855
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    #7

    Jul 26, 2017, 03:32 AM
    Like I said you will NEVER get it fully charged up! Great math skills though guys.

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