Hi, my friend and I were having discussion on the efficiency of a steam boiler in our thermodynamics lab (he has a model of a steam boiler in the thermodynamics lab). He told me that the efficiency of the steam boiler generator is dependent on the load. I thought it was absurd, saying that the efficiency of the generator has to be the same regardless of how much you load it. Apparently they vary the resistance value using a potentiometer for their experiment. Which of us is right?