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  • Need education in Electrical Mathemetics.

    I need a little help with watts. I have a 4800watt construction heater. Does the rating 4800 watts mean 4800 watts per hour?
    Am i correct in saying that if my heater ran for 1/2 hour per hour I would be using 2400 watts?

    Trying to figure out my heat loss in a building in BTU's. Converting watts to BTU's is easy.

    TIA,

    Chris

  • #2
    Re: Need education in Electrical Mathemetics.

    You need to get your units straight. If an item consumes 4800 watts, then it uses 4.8 Kilowatt Hours. ( Electricity is billed in KWH ). So, yes, if it ran for 30 minutes, it would use up 2400 watt hours ( 2.4 KWH).


    Similarly, heating and cooling would be talked about in BTU PER HOUR.

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    • #3
      Re: Need education in Electrical Mathemetics.

      The heater would consume 4800 Watt Hours over one hour of continuous use. One KWHr. (Kilo Watt Hour) is equal to 1000 Watt Hours.

      In case you need it figure on 3412 BTU Hr. per 1000 Watt Hours for a resistive element electric heater such as your's.

      Hope this helps you some.
      Last edited by Woussko; 01-04-2009, 08:23 PM.

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      • #4
        Re: Need education in Electrical Mathemetics.

        The heater is only running 7 minutes/hour @ 10F. so if my math is correct I am only using 560 watts or about 2000 btu's ......

        Thanks for your help Gentleman.

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        • #5
          Re: Need education in Electrical Mathemetics.

          Originally posted by chrisupnorth View Post
          The heater is only running 7 minutes/hour @ 10F. so if my math is correct I am only using 560 watts or about 2000 btu's ......

          Thanks for your help Gentleman.
          When the heater is cold it uses more power (draws more current).

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          • #6
            Re: Need education in Electrical Mathemetics.

            Originally posted by lovetheUSA View Post
            You need to get your units straight. If an item consumes 4800 watts, then it uses 4.8 Kilowatt Hours. ( Electricity is billed in KWH ). So, yes, if it ran for 30 minutes, it would use up 2400 watt hours ( 2.4 KWH).


            Similarly, heating and cooling would be talked about in BTU PER HOUR.
            great tips. I enjoyed reading this
            soapstone

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            • #7
              Re: Need education in Electrical Mathemetics.

              its just the maximum power or wattage output that it generates, not nessisarly what its always going to run at. you really need to know the voltage and how much current (amps) is being drawn.


              for instance 120v generating 2a 120*2=240watts

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