A body is about 50 - 100 Watt / day
some say 120 W, I use that example
And 1W = 1J
The question I solve realy was: how large mW on a 24h, a chip from 1998 is designed 250 mW activated state, and 18mW deactivated state. Designed to support very fast transmission of text, image, voice and video.