oggers,
for once we agree!
That does make the point clearly. Power used, heat and noise generated, car remaining completely motionless - hence, no work done on the car. Efficiency zero (0).
Just as the aforementioned engine on a test stand, or non-moving aircraft during an engine runup. Not achieving anything, other than generating noise and heat.
Obviously not the point you've been failing for make for six pages of this thread, but I'm happy that you've seen the light at long last!
