No, not all of it ends up as heat. Energy conversion efficiency[0] describes how much of energy type A is converted into energy type B to perform a useful acti

No, not all of it ends up as heat. Energy conversion efficiency[0] describes how much of energy type A is converted into energy type B to perform a useful activity, with the remainder being lost as wasted heat. For instance, internal combustion engines convert chemical energy into kinetic energy with up to 50% efficiency, with the rest being dissipated and requiring a radiator in the vehicle to remove the excess [wasted] heat. Which is why your car engine becomes very hot after driving the car for a little while. The same principle applies to other systems. [0] https://en.m.wikipedia.org/wiki/Energy_conversion_efficiency https://en.m.wikipedia.org/wiki/Energy_conversion_efficiency