VK= RT/ZF * log [I+]out/[I+]in
According to this equation, the equilibrium potential for potassium (VK) is equal to the product of the gas constant (R) and the temperature in degrees Kelvin (T) divided by the product of the valence of potassium (Z) and the Faraday constant (F) multiplied by the natural log of the quotient derived from the external and internal concentrations of potassium. Thus,