What that voltage difference is between the two sides of the membrane. And if we carry the same exact procedure as with the other ions, and then we take the average of those values, that will give us the resting membrane potential, So the electric potential difference across the membrane at the equilibrium point is what we call the resting membrane potential. So the resting potential is a result of the existence of the unequal distribution of these charged ions across that cell membrane. And the next question is, how can we actually calculate what the resting membrane potential is? And to demonstrate this, let's use two types of ions. So we're going to look at sodium as well as potassium.