Official unit for the physical property energy. The abbreviation is the "J".
To understand what 1 Joule is equivalent to you will see a set of examples below:
The energy of 1 Joule is invested if you lift 1 kilogram by a height of 0.1 meter (= 10 centimeters or 4 inches).
An AAA battery (NiMH, 1.25 Volts, 800 mAh) stores the energy equivalent of 3600 Joule. (1.25 Volts x 0.8 Amperes x 1 hour = 1.25 Volts x 0.8 Amperes x 3600 seconds = 3600 Joule)
Climbing a height difference of 1000 metres with a body mass of 75 kilogramms at an efficiency of 25 percent needs
Daily food demand of an adult person with moderate physical activity (today s standard) is roughly 9 000 Kilojoule (= 9 000 000 Joule).
Amounts of energy can be compared to each other - let s take a look at Ex. 3 and Ex. 4: If you make a tough walk from a valley to a peak 1000 metres higher you need 30 percent of your daily energy budget. This explains why our brain is crying for food after higher physical activities. A mining worker who works phyiscally has twice the energy demand of an office worker - and usually less body mass.