After spending a full afternoon at a dinner party with colleagues, do you feel a) happy, refreshed, and ready to do it again tomorrow or b) drained, tired and wanting to just be alone for a while to recuperate? I'm the latter, which is traditionally classified as introverted. To flip it around, the extrovert would feel drained, tired, and wanting of some social interaction after spending an afternoon sitting in front of a computer (my wife is like this).
Energy is a metaphor for the "stress level," of the individual for lack of a better term.
Energy is a metaphor for the "stress level," of the individual for lack of a better term.