Energy%20Units%20Handout

Energy%20Units%20Handout - Energy Units: Conversion and...

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Energy Units: Conversion and Comparison Prepared by Genevieve Peters UCSD Economics 132 1 of 6 Energy Measurement Units Force Pound-force (lbf) Newton (N) the force required to give a mass of 1 pound an acceleration of gravity at the surface of the Earth the force required to give a mass of 1 kilogram an acceleration of 1 meter per second per second Helpful conversions 1 kilogram = 2.2 pounds 1 newton = 0.225 pounds-force Mechanical Energy Foot-pound (ft-lb) Joule (J) mechanical energy required to lift a weight of 1 pound through a height of 1 foot the amount of work done when an applied force of 1 newton moves through a distance of 1 meter in the direction of the force Helpful conversions 1 meter = 3.28 feet 1 foot-pound = 1.36 joules Power Horsepower (hp) Watt (W) 550 foot-pounds per second 1 joule per second Helpful conversions 1 Horsepower = 746 Watts Additional Information 1 kilowatt (kW) = 1000 watts 1 megawatt (MW) = 1000 kilowatts 1 gigawatt (GW) = 1000 megawatts
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Energy Units: Conversion and Comparison Prepared by Genevieve Peters UCSD Economics 132 2 of 6 Energy Measurement Units Heat Energy British Thermal Unit (Btu) Kilocalorie (kcal) the quantity of heat energy needed to raise the temperature of 1 pound of water by 1 F the quantity of heat energy needed to raise the temperature of 1 kilogram of water by 1 C. Helpful conversions 1 kcal = 4 Btu 1 Btu = 1055 joules 1 kcal = 4220 joules 1 F = (1 C x 1.8) + 32 Additional information 1 quadrillion Btu (quad) = 10 15 Btu Electrical Energy Kilowatt-hour (kWh) the amount of electric energy consumed when an electrical power of 1 kilowatt is maintained for 1 hour. Helpful conversions A 100W lightbulb burning for 10 hours uses 1 kWh of electrical energy. 1 kWh = 3412 Btu
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This note was uploaded on 12/09/2009 for the course ECON 132 taught by Professor Peters during the Spring '07 term at UCSD.

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Energy%20Units%20Handout - Energy Units: Conversion and...

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