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Converting Watt-hr to Watts

  1. Sep 8, 2009 #1
    I'm trying to figure out how to convert watt-hrs per gallon to watts. If anyone can help it would be much appreciated!
    Thanks. ^_^
     
  2. jcsd
  3. Sep 8, 2009 #2

    mgb_phys

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    watt-hours is a unit of energy. Watts are a unit of power - so one watt for one hour would be a watt-hour
     
  4. Sep 8, 2009 #3
    1 gallon of gasoline contains about 120 million btu of energy. 1 kilowatt-hour of energy is equivalent to 3.6 million btu. So 1 gallon of gasoline contains about 33.3 kilowatt-hours of energy.
     
  5. Sep 8, 2009 #4
    Well I'm converting a car's power to watts, knowing the mpg at a specific mph and watts-hr per gallon. So I'm slightly confused because if read that you can not change watt-hr to watts?

    Can you shed some light on this for me?
     
  6. Sep 8, 2009 #5

    mgb_phys

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    mpg and mph gives you gallons/hour = power
    If you convert gallons into watt hours then you get power in watts
     
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