Why do electric motors generate heat?
Kenitec energy. I.e. Friction Electric motors operate by an electromagnetic coil around a spindle. When the electricity is turned on, the spindle begins to move, the spindle will move to the amount of input power and coil size. When the spindle moves, as-well as movement energy, it also creates Kenitec energy (Friction) The kinetic energy is dispersed as heat. In bigger engines (Hover engines) you can sometimes see light. This is where the Kenitec energy is also light energy as-well as heat.