University Physics Volume 2Moebs, W., Ling, S.J., & Sanny, J. (2016). University physics volume 2. OpenStax. CC BY 4.0 . Access for free at https://openstax.org/books/university-physics-volume-2/pages/1-introduction
For Lesson 3, read "Chapter 6: Gauss's Law" and "Chapter 7: Electric Potential."
For Lesson 4, read "Chapter 8: Capacitance" and "Chapter 9: Current & Resistance.