Well, let's examine exactly what EMF is. Remember, EMF is the amount of energy produced when warm Coulomb travels from this anode to this cathode. Or said another way, when 6.24
times ten to the 18 electrons travel from this point to this point, they produce 1.5 joy or joules of work. So what this means is that in this battery and in this battery, when one Coulomb charge travels from the animals to the cathode, both batteries produce the same amount of work. The same energy is released to do work. So what's the difference between the D and the AAA?