The Physics 3 Tutor (Electricity & Magnetism): Learning By Example DVD Series teaches students about physics through example problems that progressively grow more difficult. Emphasis is placed on giving students confidence in their skills by gradual repetition so that the skills learned are committed to long term memory. This episode covers the electric potential in of a point charge, including how the electric potential applies to a point charge. Grades 9-College. 55 minutes on DVD.