So in biochemistry, instead of using either one of those equations, we use this equation here. But basically it's the same exact equation, just it's in a slightly different form. So this is Faraday's constant. So it's 96,500. And what it basically tells us is it's the amount of charge that exists on 1 mol of electrons as they move move along that particular cell membrane. Now, Z, what Z is it's basically the value of the charge on that particular ion.