So the question is, what exactly is the voltage difference between the cell membrane of a resting membrane and how is it generated? So, let's begin. For the time being. Let's begin by assuming that the cell is only permeable to our potassium. So as potassium leaves the cell, it travels from the inside to the outside via these proteins that passively diffuse our molecules, our ions. So as our potassium leaves the cell, we have less positively charged ions.