For transmission lines: _Similarities of Wave Behavior_, presented by Dr. J. N. Shier (of Bell Labs fame, and whose team invented the phototransistor): https:

For transmission lines: _Similarities of Wave Behavior_, presented by Dr. J. N. Shier (of Bell Labs fame, and whose team invented the phototransistor): https://www.youtube.com/watch?v=DovunOxlY1k https://www.youtube.com/watch?v=DovunOxlY1k It's an easy thing to watch at any level, with both brilliant practical demonstrations and supporting math provided.