The big users are the pumps - fuel and hydraulic (in the airbus the blue electric hydraulic pump runs continuously), probably followed by the flight deck instruments and computers - and these all run constantly. As a pilot, I look at the electrical load every now and then, and never see much change from 30% on each generator.
I guess you should do a little research on the 787, as that uses electrickery for everything - no engine bleed for pressurisation or anti-ice for example ...
Last edited by Checkboard; 10th August 2012 at 13:01.