The Goldman–Hodgkin–Katz voltage equation, more commonly known as the Goldman equation, is used in cell membrane physiology to determine the reversal potential across a cell's membrane, taking into account all of the ions that are permeant through that membrane. The Goldman–Hodgkin–Katz flux equation describes the ionic flux across a cell membrane as. The Goldman-Hodgkin-Katz Equation Part 1. Goldman Hodgkin Katz Equation and Resting Membrane Potential (Read the link below BEFORE. In this video I talk about the GHK equation, and how it can be used to calculate the resting.