Why are nongated channels important in the generation of an inside-negative electric potential (voltage)of 50-70 mV across the plasma membrane of cells?

If there is no ion movement across the membrane,there is no membrane potential.This is true even if there is a difference in ion concentrations on either side of the membrane.The presence of K⁺ channels that are usually open allows for ion movement from the inside of the cell to the outside and the creation of a negative membrane potential inside the cell.