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Thread: Kilo watt hour

  1. #1
    heni72847
    Guest

    Default Kilo watt hour

    just out of interest i want to calculate how much it cost (electricity) to keep my computer running

    i opened up my comp to see the power pack
    on it it says
    +5 21A
    -5 0.5A
    +12 8A
    -12 0.5A
    and it has a 210W rating

    and Mercury charges 7.36c/kwh



    anyone good with math out there
    how much would it cost to run this computer for 8hrs

  2. #2
    Billy T
    Guest

    Default Re: Kilo watt hour

    Hi Heni

    Problem is your power supply will not be using the full 210 watts unless your box is fully loaded and if that was the case it would probably struggle, so 150-180 watts is probably closer to the mark. Add about 70 watts for your monitor and you have 250 watts or a quarter of a kilowatt.

    Probable cost will be 16 to 20 cents per 8 hours.

    Cheers

    Billy 8-{)

  3. #3
    Heather P
    Guest

    Default Re: Kilo watt hour

    As for the maths:

    1 100W lightbulb uses .1kW per hour so:
    10 100W lightbulbs use 1kW every hour (7.36c) or
    1 100 W lightbulb uses 1kW in 10 hours (7.36c).

    But as Billy says, computer power use is variable (unlike lightbulbs) so can only be worked out approximately.

  4. #4
    andy
    Guest

    Default Re: Kilo watt hour

    7.36c per unit!! This is a good deal - are you sure? I guess this doesn't include the line charges - it should if you want an accurate answer. Most suppliers have an inclusive charge of around 15 c per unit (and don't forget GST)

  5. #5
    E.ric
    Guest

    Default Re: Kilo watt hour

    you can go to http://www.mercury.co.nz and get all the options for power charges.

  6. #6
    Bazza
    Guest

    Default Re: Kilo watt hour

    Forget about lightbulbs:

    kW hours are simply the product of kW used by a device x hours.

    simple.

  7. #7
    Billy T
    Guest

    Default Re: Kilo watt hour

    It may be simple to you bazza, but it wasn't simple to heni, that's why he asked. Heather's example was simple and easy to understand.

    Yours was no help at all as it presumes knowledge that the poster might not possess.

    Cheers

    Billy 8-{)

  8. #8
    E.ric
    Guest

    Default Re: Kilo watt hour

    As Heather P was saying find out how many hours or part hours to get to one KiloWatt,

    Say you whole computer needs 250 Watts, that is four hours to get to 1KW, then work out how many hours a year or how ever long you like, say you run your computer for 2000 hours a year (that's about how long we spend at work) so that needs 500 KW/hour of energy to run each year

    If that is 10 cents a KW/H that will be $50 to run each year

    Just think of all those Fatal exception errors for just $50.

  9. #9
    E.ric
    Guest

    Default Re: Kilo watt hour

    Sorry forgot to answer the question.

    > and it has a 210W rating
    > and Mercury charges 7.36c/kwh
    > how much would it cost to run this computer for 8hrs


    With the above information
    210 Watts for 8 hours = 1.68 kW/h
    cost = 7.36 cents * 1.68 kW/h = 12.3648 Cents cost of power to run each day

    Lets say just one Fatal Exception Error per eight hours, that's costs 12 Cents. Now were can you get so much unexpected enjoyment for just 12 Cents.


  10. #10
    Heather P
    Guest

    Default Re: Kilo watt hour

    Back in 1994 (the Year of the Drought) I went through the exercise of working out what each item in the house used. As I remember toasters used quite a lot but only for a short period of time, TVs and computers were quite economic. The thing that really chewed through the power was the dryer. Used a drying rack that winter and really saved on the power.

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