Unitof Measure Equivalents Metric Conversions Electricity Terms & Definitions
UnitofMeasure Equivalents

Unit 
Equivalent 
Kilowatt (kW) 
1,000 
(One Thousand) 
Watts 
Megawatt (MW) 
1,000,000 
(One Million) 
Watts 
Gigawatt (GW) 
1,000,000,000 
(One Billion) 
Watts 
Terawatt (TW) 
1,000,000,000,000 
(One Trillion) 
Watts 
Gigawatt 
1,000,000 
(One Million) 
Kilowatts 
Thousand Gigawatts 
1,000,000,000 
(One Billion) 
Kilowatts 
Kilowatthours (kWh) 
1,000 
(One Thousand) 
Watthours 
Megawatthours (MWh) 
1,000,000 
(One Million) 
Watthours 
Gigawatthours (GWh) 
1,000,000,000 
One Billion) 
Watthours 
Terawatthours (TWh) 
1,000,000,000,000 
(One Trillion) 
Watthours 
Gigawatthours 
1,000,000 
(One Million) 
Kilowatthours 
Thousand Gigawatthours 
1,000,000,000 
(One Billion) 
Kilowatthours 
U.S. Dollar 
1,000 
(One Thousand) 
Mills 
U.S. Cent 
10 
(Ten) 
Mills 

In order to convert from U.S. units to metric units using the conversion factors shown in the following table, multiply the number of U.S. units (e.g., 2 pounds) times the conversion factor shown (0.45359237) to obtain the equivalent number in metric units (2 pounds times 0.45359237 pounds/kilograms = 0.90718474 kilograms) 
Metric Conversion 
Type of Unit 
U.S. Unit 
Times 
Conversion Factor 
Equals 
Metric Unit 
Mass 
short tons (2,000 lb) 
x 
0.907 184 7 
= 
metric tons (t) 

pounds (lb) 
x 
0.453 592 37^{a} 
= 
kilograms (kg) 
Volume 
barrels of oil (bbl) 
x 
0.158 987 3 
= 
cubic meters (m3) 

cubic feet (ft3) 
x 
0.028 316 85 
= 
cubic meters (m3) 

U.S. gallons (gal) 
x 
3.785 412 
= 
liters (L) 
Energy 
British thermal units (Btu) 
x 
1,055.055 852 62^{ab} 
= 
joules (J) 
Useful Electricity Terms 
 An ampere is the unit of measurement of electric current produced in a circuit by 1 volt acting through a resistance of 1 ohm.
 A Btu or British Thermal Unit is a standard unit for measuring the quantity of heat energy equal to the quantity of heat required to raise the temperature of 1 pound (16 ounces) of water by 1 degree Fahrenheit.
 The Capacity Factor of a generating unit is the ratio of "the electrical energy produced by a generating unit for a given period of time" to "the electrical energy that could have been produced at continuous fullpower operation during the same period."
 A circuit is a conductor or a system of conductors through which electric current flows.
 A current is a flow of electrons in an electrical conductor. The strength or rate of movement of the electricity is measured in amperes.
 Efficiency is derived by dividing the heat content of 1 kilowatthour of electricity (3,412 Btu per kilowatthour) by the number of Btu contained in the input used to produce 1 kilowatthour.
 Energy is the capacity for doing workas measured by the capability of doing work (potential energy) or the conversion of this capability to motion (kinetic energy). Energy has several forms, some of which can be converted into another form useful for work. Most of the world's convertible energy comes from fossil fuels that are burned to produce heat that is then used as a transfer medium to mechanical or other means in order accomplish tasks. Electrical energy is usually measured in watthours, while heat energy is usually measured in Btu.
 Heat Rate is a measure of generating station thermal efficiencygenerally expressed in Btu per net kilowatthour. It is computed by dividing the total Btu content of fuel burned for electricity generation by the resulting net kilowatthour generation.
 An ohm is the unit of measurement of electrical resistance. It is the resistance of a circuit in which a potential difference of 1 volt produces a current of 1 ampere.
 A watt is the electrical unit of power: that is, the rate of energy transfer equivalent to 1 ampere flowing under a pressure of 1 volt at unit power factor.
 A watthour is an electric energy unit of measure equal to 1 watt of power supplied to (or taken from) an electric circuit steadily for 1 hour.
 Source: U.S. Department of Energy / Office of Energy Information Administration
