Energy Units
1 J (joule) = 1 Ws = 4.1868 cal
1 GJ (gigajoule) = 10 E9 J
1 TJ (terajoule) = 10 E12 J
1 PJ (petajoule) = 10 E15 J
1 (kilowatt hour) kWh = 3,600,000 Joule
1 toe (tonne oil equivalent)
= 7.4 barrels of crude oil in primary energy
= 7.8 barrels in total final consumption
= 1270 m3 of natural gas
= 2.3 metric tonnes of coal *)
1 Mtoe (million tonne oil equivalent) = 41.868 PJ
Power
Electrical power is usually measured in watt (W), kilowatt (kW),
megawatt (MW), etc.
Power is energy transfer per unit of time.
1 kW =1000 W
1 MW = 1 000 000 W
1 GW = 1 000 MW
1 TW = 1 000 000 MW
Power (e.g. in W) may be measured at any point in time, whereas energy
(e.g. in kWh) has to be measured during a certain period, e.g. a
second, an hour, or a year.
UnitAbbreviations
m = metre = 3.28 ft.
s = second
h = hour
W = Watt
HP = horsepower
J = Joule
cal = calorie
toe = tonnes of oil equivalent
Hz= Hertz (cycles per second)
10 E-12 = p pico = 1/1000,000,000,000
10 E-9 = n nano = 1/1000,000,000
10 E-6 = µ micro = 1/1000,000
10 E-3 = m mili = 1/1000
10 E3 = k kilo = 1,000 = thousands
10 E6 = M mega = 1,000,000 = millions
10 E9 = G giga = 1,000,000,000
10 E12 = T tera = 1,000,000,000,000
10 E15 = P peta = 1,000,000,000,000,000
WindSpeeds
1 m/s = 3.6 km/h = 2.187 mph = 1.944 knots
1 knot = 1 nautical mile per hour = 0.5144 m/s = 1.852 km/h = 1.125
mph |
 |
