Thin films
http://loganscheiner.elementfx.com/simulations/thin-film_interference/
Build circuits with capactitors and inductors
http://www.falstad.com/circuit/e-lrc.html
Helen rates this resource as Good
Interference
Build circuits with capactitors and inductors
https://www.walter-fendt.de/html5/phen/oscillatingcircuit_en.htm
Helen rates this resource as Good
Superposition
Change p.d./current see effect on compass
Helen rates this resource as good
Standing waves
Change turns, p.d., measure B field
Longitudinal waves
Watch a flash animation of step up/step down
Helen rates this resource as Good