So let's now look at the difference between this battery or this electric chemical cell and this smaller electrochemical cell. So let us examine the difference between this D battery and the AAA battery. Well, according to this label, it says that our electromotive force of this deep battery is exactly 1.5 volts. So EMF of D is 1.5
volts. What is the EMF of the AAA battery? Well, the EMF of this guy is also 1.5 volts.