Khác biệt giữa bản sửa đổi của “Kilôwatt giờ”
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Phiên bản lúc 11:41, ngày 7 tháng 11 năm 2010
The kilowatt hour, or kilowatt-hour, (symbol kW·h, kW h) is a unit of energy equal to 1000 watt hours or 3.6 megajoules.[1][2]
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Energy in watt hours is the multiplication of power in watts and time in hours.
The kilowatt hour is most commonly known as a billing unit for energy delivered to consumers by electric utilities.
Định nghĩa
The standard unit of energy in the International System of Units (SI) is the joule (J), equal to one watt second.
Inversely, one watt is equal to 1 J/s. One kilowatt hour is 3.6 megajoules, which is the amount of energy converted if work is done at an average rate of one thousand watts for one hour.
Ví dụ
A heater rated at 1000 watts (1 kilowatt), operating for one hour uses one kilowatt hour (equivalent to 3,600 kilojoules) of energy.
Using a 60 watt light bulb for one hour consumes 0.06 kilowatt hours of electricity. Using a 60 watt light bulb for one thousand hours consumes 60 kilowatt hours of electricity.
If a 100 watt light bulb is on for one hour per day for 30 days, the energy used is 100 W × 30 h = 3,000 W·h = 3 kW·h, the equivalent of 10.8 million joules.
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Tham khảo
- ^ Taylor, Barry N. (1995). Guide for the Use of the International System of Units (SI) (Special publication 811). Gaithersburg, MD: National Institute of Standards and Technology. 31.
- ^ "Half-high dots or spaces are used to express a derived unit formed from two or more other units by multiplication." Barry N. Taylor. (2001 ed.) The International System of Units. (Special publication 330). Gaithersburg, MD: National Institute of Standards and Technology. 20
Liên kết ngoài
- Power and Energy in the Home: The Trustworthy Cyber Infrastructure for the Power Grid (TCIP) group at the University of Illinois at Urbana-Champaign has developed an applet which illustrates the consumption and cost of energy in the home, and allows the user to see the effects of manipulating the flow of electricity to various household appliances.
- Prices per kilowatt hour in the USA, Energy Information Administration