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= J = Nm = kg m 2 /s 2 = kg m 2 /s 2
1 MJ = kg m 2 /s 2 Potential Energy 1 MJ = m g h = h 1 MJ = Energy to lift 100 kg man ~1000 m
1 MJ Food and Fuels = 3 kg Celery
1 MJ Food and Fuels = 3 kg Celery = 1 kg Spinach
1 MJ Food and Fuels = 3 kg Celery = 1 kg Spinach = 36 g Coal
1 MJ Food and Fuels = 3 kg Celery = 1 kg Spinach = 36 g Coal = 33 g Butter
1 MJ Food and Fuels = 3 kg Celery = 1 kg Spinach = 36 g Coal = 33 g Butter = 26 g Oil
1 MJ Food and Fuels = 3 kg Celery = 1 kg Spinach = 36 g Coal = 33 g Butter = 26 g Oil = 20 g Gas
1 MJ Heat Energy = m (c p T + L) = m (4186/ ) x ) = m ( ) = 2.83 m = Energy to boil 0.35 kg of water
Electricity = 1/3.6 kWh = 0.28 kWh = 0.28 kW for 1 hour = 280 W for 1 hour = 3 light-bulbs for 1 hour
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