- 4.1 Charge & Current
- 4.2 Resistance & Resistivity
- 4.3 Series & Parallel Circuits
- 4.4 EMF & Internal Resistance
- 4.5 Potential Dividers
- 4.6 Longitudinal & Transverse Waves
- 4.7 EM Waves
- 4.8 Refraction & Reflection
- 4.9 Superposition & Stationary Waves
- 4.10 The Photoelectric Effect
- 4.11 Photons & Wave-Particle Duality