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    duncanmac's Avatar
    duncanmac Posts: 1, Reputation: 1
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    #1

    Dec 15, 2009, 03:45 PM
    How many watts in an amp
    Have 12volt 2.2am battery am running 12volt 14watts TV... how long will the power last,in hours please
    jim97006's Avatar
    jim97006 Posts: 7, Reputation: 1
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    #2

    Dec 16, 2009, 02:33 AM
    The calculation for power consumption is: Power (watts) = Current (amps) x Voltage.

    Rearranging, you get Current = Power / Voltage. Current = 14 watts/12 volts or 1.167 amps.

    You need to know how much energy is stored in the battery to estimate out how long it will last. If the battery says it will last X hours when using Y amps, then you could estimate the time. If not, then you might be able to hook up the TV and time how long the battery lasts.

    Even that has problems, because it also depends on what you're watching and the settings on the TV. A darker screen uses less energy than when you turn up the brightness, turning up the sound uses more energy than muting the speakers, etc.
    InfoJunkie4Life's Avatar
    InfoJunkie4Life Posts: 1,409, Reputation: 81
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    #3

    Dec 17, 2009, 05:51 AM

    You could just run a test, set it up and turn it on. Time how long it will last.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #4

    Dec 17, 2009, 10:21 AM

    Batteries are rated in ampere-hours.

    Ampere-hour - Wikipedia, the free encyclopedia
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