And so the delta G is zero, because that neutral charge will not feel any type of electric force within that voltage difference. So essentially, this is the equation that we can basically use to tell us how much energy we have to input. We have to give a charged molecule or ion to basically move it across that particular voltage difference. And by the same exact reasoning, if this is zero, that means it will not move in any direction if it is negative. What that basically means is as it moves, it releases energy. And so no work must be done.