Khan Academy

Doppler effect review (K-A)

Introduction to sound review (K-A)

Introduction to waves-video (K-A)

Production of sound (K-A)

Sound Properties: Amplitude, period, frequency, wavelength (K-A)

Transverse and longitudinal waves review (K-A)

Speed of Sound (K-A)

Standing waves in closed tubes (K-A)

Standing waves on strings (K-A)

Standing waves in open tubes (K-A)

Standing waves review (K-A)

Properties of periodic waves (K-A)

Wave characteristics review (K-A)

Wave interference (K-A)

Wave interference review (K-A)

Conductors and insulators (K-A)

Conservation of charge review (K-A)

Conservation of charge-(video) (K-A)

Coulomb's Law and electric force review (K-A)

Coulomb's Law-video (K-A)

Electric charge review (K-A)

Triboelectric effect and charge-video (K-A)

DC Ammeters and voltmeters review (K-A)

Voltmeters and Ammeters (K-A)

Current due to closing a switch: worked example (K-A)