The Resting Membrane Potential

I think I finally have some understanding of the concept of resting membrane potential . I understand that the electrical charge across a membrane is called a porential difference.  In the resting cell the potential difference is called the resting membrane potential .The resting membrane potential of neurons is approxiamately -70mV .The potential difference is a negative number because the inside of the plasma membrane is negative  compared with the outside .The greater the charge difference across the plasma membrane the greater the potential difference . It results from the pearmebility characteristcs of the resting membrane and the difference in the concentration of ions betweenthe intracellular and extracullar fluids .The resting membrane potential is established when the movement of pottassium out of the cell is equal to the movement in the cell . I Googled "resting membrane potential ", and it had different tutorials that helped me gain an better understanding of this concept  .Example a resting membrane  potential of -85mV has an greatercharge than a resting membrane of -70 mV.