Energy Units: Conversion and Comparison
Prepared by Genevieve Peters
UCSD Economics 132
1 of 6
Energy Measurement Units
Force
Poundforce (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 poundsforce
Mechanical Energy
Footpound (ftlb)
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 footpound = 1.36 joules
Power
Horsepower (hp)
Watt (W)
550 footpounds 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
This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentEnergy 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
Kilowatthour (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
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '07
 Peters
 Economics, Energy, Joule, Btu, UCSD Economics, Genevieve Peters

Click to edit the document details