Having a stronger negative or positive change on one side is called what ?

The answer is action potential. This usually happens when one side of the ion has too much negative or positive charge and by having this, if one of them is stronger in the other side, that charge will likely move on the other side in order for the ion to be balanced and to prevent the other side to be more stronger.

Ihope you find the answer

During the 1800s. hope this !