What is the efficiency of electric power converted to heat?
Well if I had an Ohmic resistor allowing 1KW of power to flow, then I'm essentially generating 1KW worth of heat aren't I? Granted, not all of the heat is dissipated in the resistor itself. Some of it is dissipated in the various transmission lines and components delivering the power.  Is my understanding correct?


Yes, sir, you are indeed correct.

Unless we account for power loss due to LED illumination or other minor physical details, all energy is dissipated as heat.

That would be the sum of these particular motor loss mechanisms:

1) Your load resistor loss

2) Motor windings (stator copper loss)

3) Friction (drag, viscous) torque

4) Static torque 

5) Magnetic core losses caused by the non-zero width of the BH curve.

6) Motor cable resistive loss