Here are some ideas that may improve your understanding of the VEUF activity.

• This is a good place to review your understanding of energy and force from previous coursework in physics.
• Don't forget the minus sign in the relationships — both directions — between potential and field.
• Note the parallels between the relationships potential/field and energy/force, and also between field/force and potential/energy.
• Make sure you understand both the mathematical and the physical relationships between these concepts.