Echo Student activity Play

Echo and reverberation Animation Play

Efficiency and economy Class activity Play

Efficiency and economy Whiteboard presentation Play

Electromotive force Class activity Play

Electromotive force Whiteboard presentation Play

Energy conversions Class activity Play

Energy conversions Whiteboard presentation Play

Energy losses Student activity Play

Energy losses Whiteboard exercise Play

Energy transformations in an electrical circuit Student activity Play

Entropy and conversion of the kinetic energy of a body into its internal energy Student activity Play

Entropy and conversion of the kinetic energy of a body into its internal energy Whiteboard exercise Play

Examples of covalent compounds with various internal structures Student activity Play

Examples of covalent compounds with various internal structures Whiteboard exercise Play

Exchange of heat and temperature Animation Play

Expansion of gases Class activity Play

Expansion of gases Whiteboard presentation Play

External and internal fertilization Slideshow Play

Female internal reproductive organs Whiteboard exercise Play

Fermat's Principle Simulation Play

Fermat's Principle Student activity Play

Fermat's Principle and the law of reflection of light Animation Play

Fertilization and development Student activity Play

Fertilization and development Whiteboard exercise Play