≈диницы измерений
Ёнергетические единицы 
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 

Ёлектроэнерги€
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. 

јббревиатуры
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 

—корость ветра
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 

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