When you turn on a light bulb, it releases energy, or heat. Humans measure the energy being released/consumed with watts. When a light bulb is on, watts are released every second, milisecond, and nanosecond while it is on. 
Humans are similar. When you are alive, you produce heat. Generally when you rest or do nothing, we release 100 watts; The amount of watts released is dependent on the amount of calories you consume and how much of it you actually burn off. 
Hmmmm.... maybe we should consider using ourselves to power up our world! (Just Kidding! :o)

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