Feynman on Wave Particle Duality (QED Lecture in New Zealand)
5 minutes of Part of the longer videos linked to below.
Feynmann on Electricity
Feynmann on Atoms
Feynmann on Magnets
Here is a youtube video where Feynmann explains gravitation. [no embed link]
There are lengthy 90-100 minute video lectures by Feynmann here.
There are four videos here by Feynmann.
Part 1: Photons - Corpuscles of Light
A gentle lead-in to the subject, Feynman starts by discussing photons and their properties.
Youtube has the talk in 9-10 minute chunks
Part 2: Fits of Reflection and Transmission - Quantum Behaviour
What are reflection and transmission, and how do they work?
Part 3: Electrons and their Interactions.
Feynman diagrams and the intricacies of particle interaction.
Part 4: New Queries
What does it mean, and where is it all leading?
BBC Video on Feynmann and Quantum Electrodynamics