In the case of the car: when you accelerate, it turns most of that electric energy into kinetic energy (and turns some of it into heat). As you cruise along at a constant velocity, it's turning most of that electricity into heat: It's overcoming air and road friction, aka, rubbing against things and producing heat. Etc.

Waste light and sound get absorbed by surfaces, thus, turned into heat (unless the waste light is in the right IR band to pass out through the atmosphere).