Energy related conversion factors
Power
1 horsepower = 736 watts
Energy
1 kilocalorie = 4190 joules
1 kilowatthour (kwh) = 3600 kilojoules = 859 kilocalories
1 m3 natural gas = 10 kwh (9,769 kWh)
1 barrel of oil = 1700 kwh
1 calorie (cal) = 4.184 J
1 British Thermal Unit (BTU) = 1055 J
Energy content of some fuels
1 kilogram of dry wood  5,3 kwh  19,0 mJ 
1 kilogram of coal  8,1 kwh  29,3 mJ 
1 cubic metre of natural gas  8,8 kwh  31,7 mJ 
1 litre of petrol  9,1 kwh  32,6 mJ 
1 litre of dieseloil  10,0 kwh  35,9 mJ 
1 kilogram of hydrogen  33,6 kwh  120,8 mJ 
1 kilogram of Uranium 235  22,2 million kwh  80,0 million mJ 
mJ = megaJoules
Thermal energy content of 1 liter of petrol = 7800 kcal
Enough energy to bring more than 8 buckets of water of 10 liter from room temperature to boiling point.
Mechanical energy in 1 litre of petrol = 9.1 kwh
It takes 1 m3 of petrol to lift a Boeing of 334 ton from ground to 10 km altitude (ignoring horizontal speed, friction, efficiency engines)
1 kilocalorie (kcal) is enough to lift a cow 1 meter.
Energy conversion
Maximum efficiency of transforming heat into mechanical energy is about 50% (Carnot formula: efficiency = (Thigh – Tlow) / Thigh )
A steamturbine in a power plant has an efficiency of 45%
Maximum efficiency conversion of mechanical energy into electricity is up to 100%
A generator in a power plant has an efficiency of 95%
Maximum efficiency conversion of electricity into mechanical energy is up to 100%
The electric motor of the “Solar car” has an efficiency of 97%
Energy prices (Netherlands, 2012):
energy source 
price per unit 
price per kwh 

1 litre of petrol = 9,1 kwh 
€ 1,81 
€ 0,20 

1 m3 of natural gas = 8,8 kwh 
€ 0,65 
€ 0,07 

1 kwh electricity from the grid 
€ 0,22 
€ 0,22 
Humans:
1 adult male human is a chemical process that generates in rest on average 100 Watt surplus heat.
1 human can produce 100 Watt of useful labour during a longer period of time.
1 wildly dancing human can produce 400 watt of thermal energy.
During short periods of time human athletes can generate up to 8001000 Watt.
Personal note: man, in his fifties in reasonable physical condition, on a hometrainer, can produce 120 Watt for 30 minutes at pulse 120. Sweating but not exhausted
1 barrel of oil = 8 years of human physical labor
1 kwh = 1 day of hard physical labor
Energy consumption average Dutch household (2.28 persons in 2008):
electricity  3560 kwh 
natural gas  1625 m3 
car  1444 liter petrol 
Average distance car: 17400 km
Primary energy in power plant: 8900 kwh (efficiency 40%)
Converted into liter gasoline equivalent:
lighting  0.4 
Fridge, tv, washing, ironing, vacuum cleaning  2.3 
heating, warm water, cooking  4.3 
car  4.0 
Total 11.0 liter gasoline equivalent
These four categories in pie diagram:
Solar Energy
Excellent and I gor what I was looking for. Thanks
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Two small nit picky errors. When using SI prefixes lower case m is for milli, upper case M is for mega so 1kg of dry wood should be 19,0MJ. Also unit that are named after someone should be uppercase, so a kilo Watt hour is kWh not kwh.
Mechanical energy in 1 litre of petrol = 9.1 kwh
It takes 1 m3 of petrol to lift a Boeing of 334 ton
here, it goes from referring to 1 litre of petrol, and then 1 cubic metre of petrol, which makes me wonder which one is correct?
I THINK I WORKED IT OUT, 1000l of petrol to a cubic metre!
Please sort out your units and metric prefixes!
Generally any metric prefix greater than 1 uses a capital letter and any unit named after someone does the same – so, eg MWh (megga watt hour). The only common exception is ‘k’ for kilo (1000). Thank you!