A joule is simply a unit to measure energy. Examples of energy include gravitational potential energy, kinetic energy, sound energy, light energy, elastic energy, nuclear energy.
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A joule is a unit of energy, so you will find joules wherever there is energy.
0.1 Joule
A "joule" (http://en.wikipedia.org/wiki/Joule).Are you playing Scattergories? :)
Joule is a unit of energy, watt is a unit of power. Power is energy per time unit. In a way, those are incompatible units, but if you know in what time you spend a certain amount of Joule, you can convert to Watt, and vice versa. For example, if you use 200 Joule in 2 seconds, that is 200/2 = 100 Joule/second, or 100 Watts. Or, if a light-bulb uses 35 Watts, that is 35 Joules every second, so in an hour it will use 35 x 3600 = 126000 Joules, or 126 KJ.
joule