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Cost to run Laptop

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  • 08-03-2012 1:49pm
    #1
    vicwatson
    Registered Users Posts: 28,404 ✭✭✭✭


    Anyone tell me how to calculate the cost of running a laptop? how do I go about finding out? Is there a place on the machine I can find the wattage or....?

    I'm trying to work out what it's costing me aprox per hour, cheers


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    #2
    bassey
    Registered Users Posts: 936 ✭✭✭bassey


    The transformer for the power supply might have the power rating (watts) you could calculate it from this


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    #3
    M cebee
    Closed Accounts Posts: 4,431 ✭✭✭M cebee


    ya but the power supply rating will exceed that of laptop

    the laptop specs i guess


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    #4
    vicwatson
    Registered Users Posts: 28,404 ✭✭✭✭vicwatson


    This is from the specs - this any help?


    130W AC Adapter

    Battery Primary 9-Cell 80W/HR LI-ION


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    #5
    M cebee
    Closed Accounts Posts: 4,431 ✭✭✭M cebee


    that's the power supply
    the 'laptop' specs should have a rating ?

    it will prob vary then depending on what you're doing

    don't know too much


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    #6
    Dardania
    Registered Users Posts: 3,612 ✭✭✭Dardania


    Try this application: http://research.microsoft.com/en-us/downloads/fe9e10c5-5c5b-450c-a674-daf55565f794/


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    #7
    vicwatson
    Registered Users Posts: 28,404 ✭✭✭✭vicwatson


    Dardania wrote: »
    Try this application: http://research.microsoft.com/en-us/downloads/fe9e10c5-5c5b-450c-a674-daf55565f794/


    Link not working can you give me a different one?


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    #8
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    vicwatson wrote: »
    Link not working can you give me a different one?

    If you want a rough cost, for 130 watts it would be 2.4 cent an hour. As has been pointed out though, the laptop will not be operating at this wattage, as this is just the power supply capacity.

    The wattage of a laptop does vary though. Its higher when the battery is charging etc. But its likely to be 50 watts or below during normal usage with another 20 watts roughly, while charging.

    So your looking at about 1 cent an hour roughly.


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    #9
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    Here is a page that shows wattages of desktops and laptops.

    Multiply watts/1000 x 18 for the cents per hour.

    Or multiply the watts x 0.018 for the cents per hour

    There will be some losses in the power supply, but not a whole lot.

    18 cent is the price of a unit of electricity.


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    #10
    vicwatson
    Registered Users Posts: 28,404 ✭✭✭✭vicwatson


    Thanks a lot

    so say the watts are 25

    25 x 0.018 cent = 0.45 cent per hour

    Have i that right?

    Cheers


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    #11
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    vicwatson wrote: »
    Thanks a lot

    so say the watts are 25

    25 x 0.018 cent = 0.45 cent per hour

    Have i that right?

    Cheers

    Yes thats it perfect. 18 (cent) being the vat inclusive price of a unit of electricity.

    So for example a 2kw kettle is 36 cent an hour.

    Which is the same as 2000 watts x 0.018 = 36


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