So EMF is 1.5 volts. That's weird. How come this more expensive larger battery has the same EMF as the smaller and cheaper battery? 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.