In an electrical motor, there may be "internal resistance", as distinct
from friction, but my memory of things electrical is old and tucked
away in a back corner which doesn't seem to be responding to queries.
HTH,
--
Darryl
Are you talking about motor (electrical) or engine ?
physical or electrical internal resistance ?
Concerning electrical electrical internal resistance of motors,
As far as I remember it comes from the copper of the resistivity
and the rotor hysteresis (magnetic remanence) .
Not sure since my electricity knowledges are getting old :-)
Hope it helps.
--
Christophe
Regards